Corn Fodder Research Articles

Impact of Harvest Age on Corn (Zea Mays) Fodder Productivity

Corn fodder is simply seeding corn kernels that are sown until the age of 8-13 days. The harvest age of corn fodder is one way to regulate plant productivity factors. The regulation of the harvest age will affect regrowth, so it is very important to pay attention so that corn fodder plants can provide optimal production in both quantity and quality. The purpose of this study was to determine the effect of differences in harvest age on the productivity of corn (Zea mays) forage. This study used the Completely Randomized Design (CRD) method consisting of 4 treatments and 5 replications, namely T1 (harvest age 7 days), T2 (harvest age 14 days), T3 (harvest age 21 days) and T4 (harvest age 28 days). The parameters observed were plant height, number of leaves, wet biomass and dry biomass. The results showed that the average height of corn fodder plants (Zea mays) was T1; 1.11, T2; 4.96, T3; 8.30 and T4; 10. The average number of leaves of corn fodder plants (Zea mays) at T1; 0.34, T2; 1.30, T3; 1.30 and T4; 2.3. The average wet biomass of corn fodder plants (Zea mays) at T1; 197.67, T2; 249.33, T3; 246 and T4; 241.67. The average dry biomass of corn fodder plants (Zea mays) at T1; 35, T2; 47, T3; 45 and T4; 41. The conclusion of this study is that corn fodder with different harvest age variations has a very significant effect on plant height, number of leaves, wet biomass and dry biomass.

Impact of Variations in Rabbit Urine Fertilizer Dosage on Corn Fodder (Zea mays) productivity

Corn is a ruminant animal feed with high vegetable protein and carbohydrate values. Because corn growers need a large area of land, one alternative is corn fodder. The application of corn fodder is very simple, harvests quickly and saves land. To support the growth of corn fodder, adequate nutrition is needed. Rabbit urine organic fertilizer contains high levels of N, P and K nutrients to increase plant productivity. This study aims to determine the effect of different doses of rabbit urine on the productivity of corn fodder (Zea mays). The method in this research is the research method used in this research is the Completely Randomized Design Method (CRD) which consists of 4 treatments, namely the concentration of rabbit urine fertilizer. Rabbit urine fertilizer concentrations consisted of 7 ml, 14 ml and 21 ml. Harvested on day 14. The parameters observed were plant height, number of leaves, wet biomass and dry biomass. Based on the results of this research, it can be concluded that the use of rabbit urine fertilizer in corn fodder at the average plant height P0=10.32 P1=11.85 P2=11.44 P3=13.67. The mean number of leaves P0=1.64 P1=1.73 P2=1.69 P3=1.81. The mean for wet biomass P0=57.37 P1=71.14 P2=74.09 P3=86.65. The average dry biomass, namely P0=6 P1=11 P2=11.40 P3=17.40. The conclusion from this research is that corn fodder given rabbit urine fertilizer has a very significant effect (P<0,01) on plant height, number of leaves, wet biomass and dry biomass.

Perbedaan Kepadatan Benih dan Nutrisi Organik terhadap Produktivitas Green Fodder Jagung

Hydroponic green fodder is a method for producing forage for livestock in a short time (approximately 7–8 days) without soil. It can be an alternative source of high–quality forage to increase the productivity of ruminant livestock. This research aims to compare differences in seed density and the addition of organic nutrients in the form of shallot skins to the productivity of maize green fodder. Fodder planting is done using a hydroponic system with an automatic watering system. The variables measured were fresh and dry biomass production, conversion of green fodder to seeds, plant height, and nutrient content in corn seeds and green fodder. The experimental design used was a 3 x 2 completely randomized factorial design with treatment factors in the form of seed density (1,25; 1,5; and 1,75 kg/m2) and organic nutrition (soaking with tap water and soaking with shallot skin). The results showed that the production of fresh biomass, dry biomass, and plant height were significantly different (P<0,05) influenced by seed density. Total fresh and dry biomass increased with increasing seed density (P<0,05). Plant height increases as seed density decreases (P<0,05). Soaking seeds using shallot skins did not have a significant effect on the productivity of corn green fodder. A seed density of 1,5 kg/m2 produces the best productivity in green fodder corn

Characterization and production hydroponic fodder for corn (Zea mays) and sorgum (Sorghum bicolor) at different harvest times

The study aimed to determine the characterization and production of hydroponic fodder corn (Zea mays) and sorghum (Sorghum bicolor) at different harvest ages. The study used a randomized complete factorial design. The first factor was plant type (corn and sorghum) and the second factor was harvest age (7 days, 10 days and 13 days). Each treatment was replicated 3 times. Variables observed included number of leaves, the growth rate of fodder plants, the fresh production of fodder plants, and the dry matter production of fodder plants. The research stages included seed preparation, planting, maintenance and harvesting. Data were analyzed using ANOVA and further test using Duncan’s Multiple Range Test. The results of the research show that corn is better used as fodder compared to sorghum, because corn fodder has a greater number of leaves, the growth speed is faster, the production of fresh and dry matter is also higher compared to sorghum fodder. A harvest time of 10 days relatively produces higher production and a shorter time compared to a harvest time of 13 days. The conclusion of this research is that the best growth and biomass production results is corn fodder crops with a harvest time of 10 days.

The Effects of Growth Stages of Some Fodder Corn Cultivars on Chemical Compounds, Parameters of Gas Production, and Ruminal Degradability

The Effects of Growth Stages of Some Fodder Corn Cultivars on Chemical Compounds, Parameters of Gas Production, and Ruminal Degradability

Pemanfaatan Limbah Tepung Tulang Sebagai Pupuk Organik Terhadap Produktivitas Hidroponik Fodder Jagung

Abstract. Livestock productivity is influenced by three factors namely breed, feed and management. Animal feed costs on average reach 70% of production costs, so feed management must be done as well as possible. A common problem faced by farmers in Indonesia is limited land for planting forage, so an alternative is needed to fulfill forage by minimizing land use, namely one way with a hydroponic system. In recent years there has been increasing interest in using short growing duration feed cultivation technology known as fodder. Based on this, the purpose of this study was to determine the utilization of bone meal waste as organic fertilizer on productivity fodder corn. The materials in this study included corn seeds, bone meal and water. The method used is a field experiment using a Completely Randomized Design (CRD). The treatment in this study was the use of bone meal as organic fertilizer, where P0 (0%), P1 (5%), P2 (10%), and P3 (15%). Each treatment was repeated 4 times. The research variables included germination percentage, normal sprout percentage, fresh forage production, and dry matter production. The data obtained was analyzed using analysis of variance. Based on the results of statistical analysis, it was shown that the use of bone meal as organic fertilizer had a very significant (P<0.01) effect on germination percentage, normal sprout percentage, fresh forage production and dry matter production. Germination percentage, normal germination percentage, fresh forage production and dry matter production were highest in P2 treatment. The values of each variable in P2 are sequentially as follows: 97.75%, 91.35%, 709.60 grams and 140.93%. Based on the results, it can be concluded that the use of 10% cast flour as organic fertilizer gives the best value to the productivity of corn fodder hydroponically.

Hydroponic corn (Zea mays L.) fodder production through the implementation of mineral fertilization: a comparative study

R Objective: To produce hydroponic corn forage using a mineral fertilization planning with three different seed types and to determine the optimal concentration for production and livestock feeding. Design/Methodology/Approach: A completely randomized experimental design was used. The following study variables were included in the design: plant height, root length, stalk thickness, and fresh biomass. Five hundred grams of three different variety seeds were selected, washed, disinfected, soaked, covered, aerated, and placed in plastic trays. Starting from the fifth day, the seeds were watered with formulated solutions until the end of production. Results: Plant height reached 17.25 cm, at a 50% concentration; root were 12.55 cm long, at a 25% concentration with Sinaloa seeds; stalks were 2.40 mm thick, at a 25% concentration with Bajío seeds; and biomass recorded 1.184 kg at a 50% concentration with Sinaloa seeds. Study Limitations/Implications: A greenhouse is not essential for fodder production, as long as the minimum necessary conditions (light, humidity, and temperature) are met. Findings/Conclusions: The 50% nutrient solution had a positive influence on the study variables that used Sinaloa variety seeds. Therefore, hydroponics would be a reliable and practical technique for producers, useful during periods of prolonged drought; it would significantly counteract agroclimatological setbacks in the agricultural, livestock, and environmental sectors.

Design and manufacture of new hybrid hydrogel and superabsorbent polymer for controlled release of fulvic acid based on grafted xanthan gum/gelatin using electron irradiation and its use in fodder corn cultivation

A humic acid-gelatin (HA-Gel) hydrogel, a gallic acid-xanthan gum (GA-XG) hydrogel, a HA-Gel/GA-XG hydrogel, and superabsorbent polymer (SAP) of HA-Gel/GA-XG/polyacrylamide (PAM) hydrogel were synthesized using electron beam irradiation method. The capability of synthesized hydrogels in loading and controlled release of fulvic acid (FA) was studied. The chemical and physical structure of sorbents was confirmed by various analyses. The effect of irradiation dose on mechanical properties, gel percentage, swelling, and absorbency under load (AUL) of the sorbents was investigated. By changing the hydrogel structures into the SAP form, its swelling capacity was increased from 37 to 320 g/g. Both hybrid hydrogel and SAP were reusable for up to 7 cycles. The maximum fertilizer loading capacities for SAP and hybrid hydrogel were 402.1 and, 175.5 mg g−1, respectively. In comparison to hydrogels, the SAP showed a slower FA-release performance. Thus, in soil media, 86 % of FA was released in 15–20 days from the hybrid hydrogel while with the SAP, 81 % of FA was released in 30–35 days. The significant improvement in the growth of fodder corn treated with FA-loaded SAP in the greenhouse media in comparison to the control groups showed the effective performance of the designed SAP, favoring its practical applications.

Corn kernel and corn fodder yield in four maize varieties in the humid tropics of Mexico

In southeastern Mexico, maize is planted for its corn kernel. Additionally, its bracts are used for tamales and handicrafts, its cobs are used as vegetables for human consumption, and its fodder is used to feed cattle.
 Objective: To evaluate the growth and yield of maize planted for corn kernel and fodder production in Loma Bonita, Oaxaca, Mexico.
 Design/Methodology/Approach: The DK7500, H-520, A7573, and VS-536 maize genotypes were used as treatments for the production of corn kernel and fodder, using a randomized blocks design with three replications. Several variables were measured: plant height, stem diameter, chlorophyll, leaf length, leaf width, and leaf area. Finally, the corn kernel and fodder yields were estimated (kg ha-1) at the time of harvest.
 Results: The genotypes under study showed significant differences (P£0.05) in plant height, stem diameter, leaf length, leaf width, and leaf area. The A7573 genotype recorded the highest corn kernel yield (20,409 kg ha-1), while fodder yield was statistically the same in the four genotypes.
 Study Limitations/Implications: An analysis of different environments in a multi-year period would help to verify the information obtained.
 Findings/Conclusions: A7573 maize had the highest corn kernel yield (20,409 kg ha-1): 15.5% higher than that of H-520 and 12.5% higher than VS-536 (control). Fodder yield was statistically similar between genotypes, ranging from 40,529 kg ha-1 (H-520) to 42,104 kg ha-1 (VS-536).

Weighing logistics: on the issue of accuracy of determining the weight of the transported goods

Methods. The results are obtained with the following methods: the method of abstractions in determining the essence of the category of «social justice»; general to specific method in establishing the unity of the existing concepts of social justice; standard methods of sociological research in determining the value system of the Ukrainians towards social justice. Results. As a result of the conducted research, the possible value of financial losses during the sale of such goods as sand, wheat, fodder corn, food corn, iron ore pellets, titanium ore, and rolled ferrous metals was determined. These losses can range from hundreds to tens of thousands of hryvnias. The list of available offers of electronic scales for weighing goods on land was analyzed, the value of error when weighing with automobile and wagon scales was determined. The possibility of describing the error using a logarithmic equation has been demonstrated, which proves that the relative weighing error decreases as the mass increases. The equation formula was found by the analytical economic-mathematical method using Microsoft Excel spreadsheets. Based on the use of the properties of the dispersion of weighing, a logistical and organizational method of increasing the accuracy of weighing has been developed, which consists in several repeated weighings and determining the resulting weight as the arithmetic mean of all attempts. A formula was developed to determine the optimal number of repeated weighings to increase accuracy, taking into account the cost of one weighing and losses during a single weighing. The method of weighing cargo on water was analyzed, its limitations were revealed and the need for its improvement was indicated in terms of taking into account such factors as water salinity, through which the draft of the vessel is measured. An analytical dependence has been developed to determine the weight of the goods loaded onto the vessel by its draft depending on the salinity of the water in which the vehicle is located. Novelty. In the process of analyzing exporters’ losses during product weighing, logistical and organizational measures have been developed that are guaranteed to reduce losses. Practical value. Techniques are proposed that will reduce the exporter’s losses when weighing goods both on land and at sea, which will allow adjusting the size of the weighing error with available devices.

Nutritional Evaluation of Hydroponic Corn Fodder and its Effect as Substitute for Feed Concentrates for Buffalo Calves

This study investigated the effects of hydroponic corn fodder on the growth performance of buffalo calves. Twelve Bulgarian Murrah buffalo calves were divided into two treatment groups: T1, fed with Napier grass and starter feed concentrates, and T2, fed with Napier grass, starter feed concentrates, and hydroponic corn fodder, replacing 50% of the starter feed concentrate. The study found no significant differences between the two groups' average total weight gain and average daily gain. However, the average daily feed intake was significantly higher in T2, possibly due to the tender and young nature of the hydroponic corn fodder. Dry matter and crude protein intake did not show any significant differences between the two groups. The digestibility of nutrients showed a significant difference in dry matter digestibility between T1 and T2. Feed cost per d was significantly lower in T1, but the cost of feed per kg gain was lower in T2. This study suggested that supplementing buffalo calves' diets with hydroponic corn fodder could have a beneficial effect on their growth performance and economic viability. It recommends further research on the use of other grains as fodder for ruminants. Overall, this study highlighted the potential of hydroponic corn production as a sustainable source of fodder for ruminants.

Evaluation of the Growth and Yield of Organic Corn Fodder under Various Watering Times and Concentrations of Rabbit Urine Fertilizers

Organic Fodder System is a planting system without using soil as its main medium. The use of fertilizers can be regulated in quantities and concentrations that correspond to the needs of plants during the plant growth season to obtain optimal results with good quality. The study was conducted to determine corn fodder's growth productivity and nutrient content under the treatment of differences in watering time and rabbit urine fertilizer concentration. The treatment was carried out on the difference in the soaking solution of corn kernels and the difference in the watering time of corn seedlings. Soaking was carried out by 5 solutions namely L0: water, L1: AB mix (commercial fertilizer) 1%, L2: rabbit urine fertilizer 1%, L3: rabbit urine fertilizer 2.5%, L4: rabbit urine fertilizer 5%, as treatment, and 5 (five) replication groups. Watering was carried out at three different time intervals (W1: 6 hours/day, W2: 9 hours/day, W3: 12 hours/day) with five replication groups. The variables observed were germination percentage, normal sprout percentage, corn fodder height, fresh fodder production, fodder dry matter production, fodder protein content, fodder crude fiber content, fodder crude fat content, Non-Nitrogen Free Extract (NNFE), and corn fodder ash content. The experimental design used in this study was a Completely Randomized Design of factorial patterns. Differences in rabbit urine fertilizer concentration and watering time impact germination percentage, normal germination percentage, plant height, fresh matter production, dry matter production, protein content, and crude fiber.

420 Integrating Livestock and Cropping Systems: Interseeding Cereal Rye into Corn for Late Season Grazing

Abstract The objective of this project was to evaluate the effect of interseeding cereal rye (Secale cereale) into corn (Zea mays) for use as grazed forage after corn grain harvest on corn grain yield and additional grazing day· ha-1. In a 4-year study, corn was planted (64,246 plants· ha-1) in spring on two, 4.8-ha fields in central Pennsylvania. Cereal rye was interseeded (135 kg· ha-1) into the corn at the V4-V6 stage. Corn was harvested as grain in November and each field was divided into six, 0.8-ha paddocks and randomly assigned to either grazed (GRAZ) or ungrazed (NG) treatments. Beef cattle frontal-grazed three of the paddocks (four cows· paddock-1) in each field approximately four to five weeks after corn grain harvest and, if re-growth allowed, again in early spring before subsequent corn planting. Corn grain, corn fodder (after grain harvest), and cereal rye yields were monitored each fall. Cereal rye growth was also monitored in early spring. Statistical analyses on corn grain yield and forage biomass were conducted using the MIXED procedure in SAS 9.4 (SAS Institute, Cary, NC, USA). Least square means were separated using Fisher’s least significant difference test (α = 0.05). There were no site by treatment interactions, therefore means are presented as an average across both sites (Table 1). Corn grain, corn stover, and cereal rye yields were affected by year. Corn grain yields did not decrease as a result of grazing, or of repeated plantings of corn, ranging from 9,516-10,088 kg· ha-1 across GRAZ and NG paddocks except in 2019 (dry year) when corn grain yields averaged 6,053 kg· ha-1 across both GRAZ and NG treatments. Spring grazing only occurred in one year (2021) due to insufficient cereal rye growth in the other years. On average, the cereal rye (plus the corn stover) provided enough forage for an additional 115-130 grazing days· ha-1 in the fall. Results of this study showed that when corn is harvested too late in the year to establish a cover crop, interseeding annual forages into growing corn provides winter ground cover and an opportunity for late season grazing. Interseeding cereal rye into the corn did not negatively impact corn grain yields with repeated corn planting. While early spring growth of the cereal rye has the potential to provide even greater forage yields than fall, it is much less dependable than fall due to the potential of delayed spring growth or lack of winter precipitation under the conditions of the current study.

Effects of government policies reform on environmental sustainability: An integrated approach of PMP and system dynamics simulation model

The government's supportive policies in the agricultural sector may provide some goals intended by policymakers; however, they may have environmental, social, and sometimes economic inefficiencies. Therefore, policy analysis not only needs to examine the effectiveness of these policies from the point of view of economic components but also, in a more comprehensive view, should assess the impact of these policies on other aspects like sustainability. In this study, an integrated Positive Mathematical Programming (PMP) and System Dynamics (SD) model was developed to investigate the effects of the agricultural policy reform on the cultivation pattern and water resources sustainability in the Doroodzan Dam basin in Fars Province, southern Iran, where managing water resources is a seriously challenging due to population growth and periodic drought. The initial investigation involved analyzing how price policies (guaranteed price and world price of crops) and non-price policies (removal of subsidy payments to agricultural inputs and improvement of irrigation efficiency) impacted the cropping pattern. The results of the study showed that the most significant decrease in cropland area occurs due to the removal of agricultural input subsidies. Although this crop pattern can lead to environmental sustainability, it is not considered from the point of view of food self-sufficiency. Based on the results, applying world prices increase cropping area for crops like rice, which is a water-intensive crop. Another point was the high priority of onions, fodder corn, and beans while they are not subjected to governmental pricing intervention. This may indicate the extent of public policies' impact on agriculture. Although under some policy scenarios changes in the gross margin or cropping area do not sound significant, the water-saving nature of these policies is more compelling. Finally, the impact of altering cropping patterns along with climate change and population growth on water indices was assessed using SD modeling. Thus, reforming the government's policies in the agricultural sector may help reduce the water shortage index in the basin. The policy of removing subsidies for the agricultural inputs led to the attainment of the lowest water shortage index.

Crop monitoring and biomass estimation based on downscaled remote sensing data in AquaCrop model (case study: Qazvin Plain, Iran).

Ensuring food security requires monitoring crop growth conditions prior to harvesting. This research encompass three stages: remote sensing, crop modeling, and establishing a connection between the two. Besides, Fusion satellite images have been implemented to monitor and investigate fodder corn in three study areas. In the remote sensing stage, after implementing the downscaling algorithm and producing the leaf area index (LAI) time series, the results were compared with the estimated values from Landsat 8 and MODIS images, which were associated with overestimation in all cases. Furthermore, the results exhibited statistically significance with R2 > 95% and P-value < 0.05. The AquaCrop model was first calibrated and implemented in the crop modeling section at each growth stage based on the observational data measured in each field. The accuracy of the simulated model was checked according to the results of statistical indicators with high accuracy (NRMSE = 10% and RMSE = 0.03 (Ton/ha)) at significant level (95%) and was associated with underestimation. Using the SVM decision support algorithm, the relationship between downscaled LAI and calibrated CC (crop canopy) was estimated. This relationship was generated with 70% of the data and subsequently validated using the remaining 30% (R2 = 0.99, NRMSE = 0.01). On this basis, CC values were predicted. Finally, biomass values were compared with observed biomass values. According to the results of statistical indicators (RMSE = 0.19 (Ton/ha), NRMSE = 0.01, R2 = 0.96, P-value < 0.05), biomass estimation was highly accurate. These results demonstrate the reliability and accuracy of the model and the proposed method for simulating and estimating biomass before harvesting.

Effect of Substitution of Corn (&lt;em&gt;Zea mays&lt;/em&gt;) Fodder with Sorghum (&lt;em&gt;Sorghum bicolor&lt;/em&gt; var. Numbu) Fodder on Nutrient Digestibility and Daily Weight Gain of Beef Cattle

Purpose: Corn fodder is often used for fattening beef cattle, which compete for feeding other livestock. However, Sorghum fodder has a nutritional value equivalent to corn fodder. This study aims to determine the effect of substituting of corn fodder with sorghum fodder on the body weight gain of cattle and also the digestibility of nutrients.Research method: Nine local beef cattle with weights ranging from 139-239 kg were allocated in a completely randomized design with 3 treatments and 3 replications. The treatments given were: R0 = basal ration (30% corn fodder + 70% concentrate); R1 =15% corn fodder +15% sorghum fodder +70% concentrate; and R2 = 30% sorghum fodder + 70% concentrate. The data were analyzed using covariance analysis. Body weight gain; digestibility of dry matter, digestibility of organic matter, digestibility of crude protein, and digestibility of crude fibre were measured.Findings: Based on the analysis of covariance, the study showed that there was no significant difference (P&gt;0.05) between substituted sorghum fodder and ration consumption, body weight gain, ration conversion, and digestibility of feed substances (dry matter, organic matter, crude protein, and crude fibre) in beef cattle. The results showed that body weight gain ranged from 0.63-1.18 kg/head/day, feed conversion ratio ranged from 5.12-9.66, and digestibility of dry matter, organic matter, crude protein, and crude fibre, 76.29%-79.10%; 79.16%-82.16%; 72.47%-76.13%; and 45.46%-46.70% respectively. This study revealed that Tebon corn can be completely (100%) substituted by fodder sorghum in beef cattle rations.Research limitations: This research was conducted at the farmer level, which causes the diversity of cattle used as experimental material to be quite high. Therefore, in analyzing the data, we used covariance analysis.Originality/Value: This research informs that the use of forage sorghum can replace corn fodder up to a limit of 100%.

Pendampingan teknologi hidroponik fodder di Gampong Cot Karieng Kecamatan Blang Bintang, Aceh Besar (Fodder hydroponic technology assistance in Cot Karieng Village Blang Bintang Sub-District, Aceh Besar)

The livestock fattening business carried out by the partner group in Cot Karieng Village Blang Bintang Sub-District, Aceh Besar is a part-time business with a traditional pattern. Provision of feed only relies on efforts to find field grass every day. Meanwhile, the availability of forage is very fluctuating wherein during the rainy season, fresh forage is abundantly available, while during the dry season, it is very scarce. The purpose of this activity was to increase the knowledge and skills of partner groups in procuring animal feed, especially for the dry season. The solution offered was the use of hydroponic forage cultivation technology (hydroponic fodder). The seed of the fodder plant used was corn seed. The program implementation method was carried out through a participatory approach (partners were involved and worked together) starting from the initial stage to the final stage. In the first stage, coordination meetings were held so that all involved parties understood the scope of activities. In the second stage, training was carried out on hydroponic fodder cultivation methods, while assembling and applying technology which included making fodder houses (green-houses), installing green-house water networks and the process of cultivating hydroponic fodder plants was conducted in in the third stage. The stages of the cultivation process included washing and disinfecting the corn seeds by immersing them in a 1% chlorine solution for 15 minutes, then the seeds were spread out on trays. Seed moisture was always maintained by an aeroponic system every 1-2 hours for 10 minutes. After 14 days of cultivation, 1 kg of corn seed produced 6 kg of corn fodder. After washing and air-drying the corn fodder was ready to be given to livestock. The results achieved from all the implementation of this activity are the availability of facilities for the production of fodder hydroponic fodder system and the partner groups already have the skills of cultivating fodder using hydroponic fodder system.

Volunteer Plants' Occurrence and the Environmental Adaptability of Genetically Modified Fodder Corn upon Unintentional Release into the Environment.

The number of corn cultivars that have been improved using genetically modified technology continues to increase. However, concerns about the unintentional release of living-modified organisms (LMOs) into the environment still exist. Specifically, there are cases where LMO crops grown as fodder are released into the environment and form a volunteer plant community, which raises concerns about their safety. In this study, we analyzed the possibility of weediness and volunteer plants' occurrence when GMO fodder corn grains distributed in Korea are unintentionally released into the environment. Volunteer plants' occurrence was investigated by directly sowing grains in an untreated field. The results showed that the germination rate was extremely low, and even if a corn seed germinated, it could not grow into an adult plant and would die due to weed competition. In addition, the germination rate of edible and fodder grains was affected by temperature (it was high at 20 °C and 30 °C but low at 40 °C and extremely low at 10 °C), and it was higher in the former than in the latter. And the germination rate was higher in Daehakchal (edible corn grains) than in Gwangpyeongok (fodder corn grains). The environmental risk assessment data obtained in this study can be used for future evaluations of the weediness potential of crops and the development of volunteer plant suppression technology in response to unintentional GMO release.

HISTORIA Y PERSPECTIVAS DEL MEJORAMIENTO GENÉTICO DEL MAÍZ FORRAJERO EN LA ARGENTINA

Corn is used to massively produce food for humans and domestic animals with grains of various taxonomic entities or races. For domestic ruminants, the whole plant is also used as forage. In Argentina, both corn grain and whole-plant silage are used for beef and dairy cattle production. This paper aimed to develop the history and perspectives of corn grown for grain and silage, focusing on plant breeding. The importance of corn fodder in its two variants (grain and whole-plant silage) has varied over time. We emphasize herein the importance of the specific genetic breeding of corn used for whole-plant silage to achieve higher yield potential and nutritional value than grain hybrids. The four population genetic structures used over time as cultivars, which determined the evolution of the technological process of selection and breeding, were analyzed. Based on the research carried out, seed companies have incorporated our protocols into their development and breeding programs. The contribution of selection and breeding in Argentina was effective in transforming the corn plant into ruminant feed, and this will increase with the development of specific silage hybrids. Key words: cultivars, corn fodder, plant breeding

Effect of Methyl Jasmonate and Potassium and Their Combined Action on Drought Tolerance of Fodder Corn

Effect of Methyl Jasmonate and Potassium and Their Combined Action on Drought Tolerance of Fodder Corn