Yielding Rice Varieties Research Articles

Mitigation of salt stress in rice (oryza sativa l.) growth and yield in coastal saline soil using crop residue-driven organic amendments under varying moisture conditions

The increasing salinity in coastal areas due to climate change significantly hinders rice (Oryza sativa L.) production, a crucial food source for over half of the global population. This study evaluates the effects of organic amendments and moisture conditions on the vegetative growth and yield of rice varieties in a saline field in the Khulna district of Bangladesh. The field experiment was conducted from February to May 2020, using rice straw compost (RSC), sawdust (SD), rice husk (RH), and mustard seed meal (MSM) at varying rates (0, 5, 10, 15 t ha-1) under moist (70% soil moisture) and saturated (>100% soil moisture) conditions. The experiment featured BRRI dhan 28 (salt-sensitive) and BRRI dhan 47 (salt-tolerant) varieties. Key metrics evaluated in the study included the productive to unproductive tillers ratio (PTR), spikelet sterility, percent filled grains, straw yield, and grain yield. Results indicated significant (p ≤0.05) improvements in PTR, reduction in spikelet sterility, increased grain filling, and higher straw and grain yields with applying organic amendments, especially MSM. The highest PTR for BRRI dhan 47 (0.86) was achieved with MSM at 5 t ha-1 under moist conditions, while BRRI dhan 28 reached a PTR of 0.81 with RH at 10 t ha-1 under saturated conditions. Spikelet sterility was minimized (9/panicle) with MSM at 5 t ha-1 under saturated conditions for both varieties. Percent filled grains peaked (88.9%) with MSM at 5 t ha-1 for BRRI dhan 28. Enhanced straw yields were observed, with BRRI dhan 47 achieving 8.76 t ha-1 with MSM at 10 t ha-1. Grain yield increased significantly, with BRRI dhan 28 yielding 5.75 t ha-1 under similar conditions. The study confirms that organic amendments of MSM > RSC > SD > RH can effectively mitigate salt and moisture stress, thereby improving rice productivity in saline soils. Dhaka Univ. J. Biol. Sci. 33(2): 1-13, 2024 (July)

Optimizing the Total Spikelets Increased Grain Yield in Rice

Maximizing rice yield potential has always been the focus of high-yield rice cultivation research. For high-yield rice cultivation and breeding, more research into the link between yield and yield components is essential. In this experiment, 38 rice varieties with different yield types and 185 rice varieties as materials were chosen. The relationships between yield and yield components were studied. The regulation effects of total nitrogen application rate (TNAR) on yield and yield components were observed. The results showed that (1) the grain yield of high-yield varieties was 189.3−195.6%, 76.1−77.7%, and 27.0−28.7% higher than that of super-low-yield, low-yield, and medium-yield varieties, respectively. Compared with rice varieties with other yield types, rice varieties with high-yield type have a higher total number of spikelets. (2) The spikelet number per panicle and total number of spikelets were significantly positively linked with grain yield, but significantly negatively correlated with filled grains and grain weight. (3) With an increase in TNAR (0−340 kg ha−1), the panicles, spikelet number per panicle, and total spikelets of rice varieties with different yield types increased gradually, and the filled grains and grain weight decreased gradually. The higher the TNAR, the more obvious the decrease in filled grains and grain weight. The grain yield of rice varieties with different yield types was the highest under the TNAR at 250 kg ha−1. The main factor contributing to its high yield was the substantial increase in total spikelets. The above results showed that increasing the spikelet number per panicle and total spikelets played a material role in improving rice yield.

Effect of Organic Manures on Growth and Yield of Rice Varieties (Oryza sativa L.) and Yield Validation using SPSS Model

The experiment was conducted during the Kharif season 2022, at the Crop Research Farm, Department of Agronomy, Naini Agricultural Institute, Sam Higginbottom University of Agriculture, Technology and Science, Prayagraj (U.P.) to find out the “Effect of Organic manures on growth and yield of Rice varieties (Oryza sativa L.) and yield validation using SPSS model”. The experiment was laid out in Randomized Block Design comprising of 9 treatments which include 3 varieties NDR-359, BPT-5204 and MTU-7029 and 3 organic manures Poultry manure 5(t/ha), Vermicompost 10(t/ha) and Poultry manure 2.5(t/ha) + Vermicompost 5(t/ha). Whose effect is observed in Rice varieties. The result showed that the treatment with the application of MTU-7029 + Poultry manure 2.5(t/ha) and Vermicompost 5(t/ha) at 100 DAT was recorded higher in number of tillers per hill (13.1/hill), and also recorded significant and higher number of effective tillers per hill (11.33/hill), number of grains per panicle (112.33), test weight (22.20 g), grain yield (5.21 t/ha) and straw yield (6.49 t/ha), Harvest index (44.45 %). Higher gross return (1,50,920.91 INR/ha), net return (1,00,770.91 INR/ha) and benefit-cost ratio (2.01) was recorded in the application of (MTU-7029 + Poultry manure 2.5 t/ha + Vermicompost 5 t/ha) as compared to other treatments. Treatment 9 has shown 44.68 % increase over predicted yield whereas there was 26.58 % increase in treatment 8 over predicted yield through SPSS model.

Effect of liquid organic fertilizer on growth and yield of rice varieties in rainfed field

Rice is a superior crop that is cultivated and increased in productivity. Increasing rice productivity is done in an efficient way, especially in rainfed land, namely the addition of Liquid Organic Fertilizer (LOF) and variety selection. The purpose of the study was to determine the effect of LOF, the effect of interaction between LOF and varieties on growth. This research is experimental using the RAK split plot method consisting of two factors. The first factor is LOF consisting of fermented banana stump, coconut fiber, bamboo shoots and maja fruit as the main plot with 2 levels of treatment, namely without LOF and with LOF. The second factor is rice varieties as subplots with 5 treatment levels. Combination of 2 levels of LOF and 5 levels of rice varieties. The number of sapling, net assimilation rate, and relative growth rate of rice with LOF were significantly different from those without LOF. The provision of LOF on the Inpari Sidenuk variety has the highest average number of sapling, which is 18 stems and is significantly different from the treatment without LOF which has an average number of tillers of 15.40 stems. So that the provision of LOF provides growth on rainfed land.

Effect on nitrogen use efficiency and yield of rice variety (BRRI dhan50) under different nitrogen fertilizer rates

Effect on nitrogen use efficiency and yield of rice variety (BRRI dhan50) under different nitrogen fertilizer rates

Effect of Qiangdi 863 Nanosynergids Treated Water, Nitrogen, Phosphorous and Potassium Fertilizers on Rice Growth Physiology and Grain Quality.

Nanotechnology is an emerging technique that helps in solving the biotic and abiotic agricultural issues leading to enhance crop productivity. Therefore, it was hypothesized to check the effect of Qiangdi 863 nano synergids biological-assisted growth apparatus and nitrogen, phosphorous, and potassium (NPK) fertilizers improving rice germination, early growth, physiology, and yield. An experiment was performed on five rice varieties for three consecutive years (2017–2019). The nanosynergids-treated water (NTW) significantly improved the speed of germination (25.3, 35.6, and 32.3%), final emergence percentage (100%) and seed emergence energy percentage (80, 95, and 90%), radical (1.25, 1.7, and 2.35 cm) and plumule growth (1.29, 1.24, and 1.66 cm), soil plant analysis development (46, 45, and 47), antioxidant enzymatic activities, such as catalase activity (34,376 μg–1FW h–1, 33,264 μg–1FW h–1, and 34,453 μg–1F W h–1), superoxide dismutase (18,456 μg–1F W h–1, 19,445 μg–1F W h–1, and 19,954 μg–1F W h–1), peroxide (745 Ug–1F W, 734 Ug–1F W, and 752 Ug–1F W), production and declined malondialdehyde (4.5 μmolg–1F W, 5.1 μmolg–1F W, and 4.2 μmolg–1F W) for all years respectively in KSK 133. The application of nano-treated irrigated water enriched the biomass of rice seedlings. The overall nano synergid treatments successfully enhanced the endogenous hormones as salicylic acid (6,016.27 p mol/L, 5823.22 p mol/L, and 5922.12 p mol/L), jasmonates (JA) (5,175.6 p mol/L, 4231 p mol/L, and 5014.21 p mol/L) brassinosteroids (BR) (618.2 p mol/L, 546.83 p mol/L, and 582.1 p mol/L) quantification and yield 1000 grain weight (22.3, 22, and 23.2 g) of KSK 133. Hence, the overall results proved that NTW could effectively enhance the early growth and yield of rice varieties.

Comparison of the Yield of Different Rice Varieties Treated with l-Ascorbic Acid on Site-Specific Saline Soil

We conducted a comparative study of the effect of vitamin C (l-ascorbic acid) treatment on the yield of selected rice varieties grown in site-specific saline soil; the study area was Paluh Merbau, which is situated on the east coast of North Sumatra and has a salinity of 5.9 dS/m. Salinity causes osmotic, salt-specific, and oxidative stress, which negatively affects crop yields. The aim of this study was to compare the effects of l-ascorbic acid treatment on the yield parameters of eight varieties of rice grown on saline soil. This study was based on a randomized block design with two factors. The first factor was the rice variety (Ciherang, IR 64, Lambur, Batanghari, Banyuasin, IR 42, Inpara 10, and Margasari), and the second factor was the concentration of l-ascorbic acid (0, 500, 1,000, or 1,500 mg/L). The number of empty grains per panicles, grain weight per clump, and number of filled grains per panicles increased as the concentration of l-ascorbic acid increased. l-Ascorbic acid at a concentration of 1,500 mg/L exhibited the best results, and the grain weight of Banyuasin and Batanghari varieties was 33.22 and 30.18 g, respectively; however, there was no significant difference in grain weight between the varieties. Batanghari and Ciherang were the most salt-tolerant genotypes, with a high ability to produce high number of filled grains compared to other varieties. l-Ascorbic acid treatment can promote the yields of rice varieties grown under salinity stress.

Effect of nitrogen levels on yield of rice varieties during kharif in South Odisha

A field experiment was conducted at Experimental Farm of M. S. Swaminathan School of Agriculture, Paralakhemundi during kharif season of 2021 in south Odisha to study the effect of different nitrogen levels on the rice varieties. The experiment was laid out in a split plot design with three rice varieties, namely MTU 7029 (Swarna), BPT 5204 (Samba Mahsuri) and BPT 3291 (Sona Mahsuri) in main plots and four levels of N (0, 50,100 and 150 kg N/ha) in sub plots. The plant height and dry matter, yield attributes and grain yield were significantly higher in variety MTU 7029 (Swarna) over BPT 5204 and BPT 3291 (Sona Mahsuri). Application of 100 kg N/ha recorded significantly higher yield over 0, 50 and 150 kg N/ha. Application of 100 kg N/ha to variety BPT 5204 was found suitable for getting higher yield in southern Odisha in kharif season.

Yield performances of rice varieties (Oryza sativa) under nano-CuO and nano-ZnO micronutrient fertilizers

Abstract. Sandanayake CLT, Weerakoon SR, Karthikeyan N, Somaratne S. 2022. Yield performances of rice varieties (Oryza sativa) under nano-CuO and nano-ZnO micronutrient fertilizers. Nusantara Bioscience 14: 95-103. Rice (Oryza sativa L.) is a major staple food in the world. There is an extreme need for higher rice yield to meet the ever-increasing demand with the rise in population despite the hampering impact of climatic changes. Nanotechnology plays a potential role in food security and introduces nano fertilizers as an alternative to conventional fertilizers. Therefore, the present research was carried out to determine the effects of nano micronutrient fertilizers; nano-CuO, and nano-ZnO on the yield of selected rice varieties, Bg360, BW364, Kaluheenati, and Kuruluthuda. Sol-gel and thermal decomposition methods synthesized nano-fertilizers used in the study. Nano-ZnO, nano-CuO, and nano-CuO-ZnO composite treatments were applied as a foliar spray at concentrations of 30 mg L-1 (T1), 60 mg L-1 (T2), and 120 mg L-1 (T3) and double deionized water served as the control (T0). The synthesized nano-fertilizers were applied during the growth stage [at 48-58 days after sowing (DAS)] and grain filling stage [100-105 DAS], while the plants were provided with appropriate levels of N, P, and K fertilizers, as recommended by Department of Agriculture. A Complete Randomized Block Design was employed with three blocks and five replicates in each block. The Yield parameters were recorded at the harvesting stage. Descriptive statistics such as mean and standard error of mean and inferential statistics were performed on the data obtained. ANOVA with interaction terms was performed to assess the significant differences between the treatments. The descriptive analyses show an increase in the yield of the rice varieties under the application of nano-fertilizers. ANOVA suggests a significant effect (p ? 0.05) of nano-CuO and nano-ZnO on the yield of rice varieties used in the study. Both traditional and inbred rice varieties indicated yield response to applied nano-fertilizers.

Ecological testing results of the rice varieties of the ARC “Donskoy” in the Krasnodar Territory

In order to increase gross harvest and productivity of rice, the development of new varieties and their timely use in production is of great importance. The Federal Research Center of Rice and Agricultural Research Center “Donskoy” regularly develop more productive varieties with improved resistance to diseases and other factors. Each variety forms a specific response to various agro-ecological conditions, which affects productivity, which is the main indicator of cost and demand in crop production. The purpose of the current study was a joint ecological testing of new rice varieties, developed in the Agricultural Research Center “Donskoy” in the growing conditions of the Krasnodar Territory jointly with the Federal Research Center of Rice. The study has revealed significant differences in the productivity. The yields of rice varieties varied significantly depending on the variant of the trial. In the ESOS “Krasnaya” the variety ‘Kapitan’ sown after three forecrops and with two variants of fertilizing was the best one, forming 7.26 t/ha and exceeding the standard variety ‘Rapan’ on 0.37 t/ha. In the RPZ “Krasnoarmeisky”, the variety also produced the maximum yield (7.11 t/ha). In 2021, the variety ‘Kapitan’ produced 8.47 t/ha in the JSC “Agrocomplex Rossiya” and 5.00 t/ha in the AF “Kuban” at the level of the new standard ‘Rapan 2’. The productivity of the studied varieties highly positively correlated with the traits ‘length of panicle’ (r = 0.83±0.13), ‘1000-kernel weight’ (r = 0.97±0.10), ‘kernel weight per panicle’ (r=0.97±0.15); there was a mean positive correlation with the traits ‘plant height’ (r = 0.67±0.20) and ‘number of productive stems per area unit’ (r = 0.59±0.18). In the ecological testing in four farms, rice productivity was closely positively correlated with each other (r was from 0.804 to 0.999) with large differences in absolute values. For cultivation in the Krasnodar Territory there has been recommended a high-productive variety ‘Kapitan’ of joint breeding of the ARC “Donskoy” and the FSC of Rice.

Influence of the water and food regime of the soil on the yield of rice varieties during sprinkling in the Lower Volga region

In the Russian Federation, as in most countries of the world, rice is cultivated under artificial irrigation by flooding the field with a layer of water, which is maintained during almost the entire growing season. Unfortunately, within the rice-growing zone in the Russian Federation, water resources are limited and this limits the expansion of sown areas under flooded rice. At the same time, judging by the biological characteristics of this plant, a fundamentally different method of rice cultivation is also possible, when the field occupied by it is not flooded. The rice’s water demand is met by using the soil moisture reserves, which are maintained at a certain level by irrigation.

EFFECT OF AMELIORANT ON GROWTH AND YIELD OF RICE AT TIDAL PADDY FIELD

<p>Rice (<em>Oryza sativa </em>L.) is the most important and strategic food crop in Indonesia, but low productivity in tidal paddy fields is a serious problem that must be overcome. The application of ameliorant would be worthy to increase the growth and yield of rice in tidal paddy fields. The study aimed to investigate the effect of ameliorant application on growth and yield of rice varieties in tidal paddy fields. The study was arranged in a split plot design with five replications. Rice varieties tested were Inpari 34, Dendang, Inpara 9, Inpari 35, and Ciherang as the main plot, and ameliorant types studied were humic acid, gypsum, zeolite, and organic fertilizer as the subplot. The results showed that the use of different rice varieties and amelioran types significantly increased the growth and yield of rice. Inpara 9 produced 7.6 t.ha-1 dry milled grain (DMG) or increased by 33.3% compared to Ciherang variety. Humic acid application at 25 kg ha-1 increased grain yield by 21.3% higher than that without ameliorant treatment. The best treatment to increase the growth and yield of rice in tidal paddy field was a combination of humic acid 25 kg.ha-1 and Inpari 34 which produced the DMG of 8.6 t ha-1 or 41% higher compared to Ciherang without ameliorant.</p>

An Investigation of the Effect of Different Levels of Nitrogen Fertilizers on Yield of Rice Varieties in Tons

This study examined the effect of various nitrogen fertilizers in kilograms: 0kg, 30kg, 60kg, and 120kg on varieties of rice: NERICA L-19; NERICA L-20; NERICA L-41; NERICA L-42; and NERICA L-60 from the department of plant physiology and crop production in the college of plant science and crop production Federal University of Agriculture Abeokuta (FUNAAB), Ogun State Nigeria. Also, to determine the appropriate fertilizer at different levels and the best variety for optimum yield of rice and to compare the treatment means for each of the crop varieties. Analysis of Variance technique was used to investigate the effect of various kilograms of nitrogen fertilizers on the yield of the five different types of NERICA rice. The findings revealed that at all the levels of nitrogen fertilizers applied, 30kg of nitrogen fertilizer gave the optimum yield. Further to that, the study discovered that different levels of the nitrogen fertilizers applied did not significantly influence the tons of NERICA rice produced, that is the yield of rice in tons is independent of kilograms of nitrogen fertilizers applied. NERICA L-42 of rice is therefore recommended to farmers to be planted with 30kg of nitrogen fertilizers.

Content of inorganic elements in rice grain depending on irrigation methods

Purpose. To study the content of heavy metals in the grain of two varieties of rice under different irrigation conditions. To estimate the content of basic microelements – components of redox systems of plants in the grain of rice for biofortification and inhibition of heavy metal accumulation. Methods. Plants of rice varieties ‘Consul’ and ‘Viscount’ were grown on the experimental fields of the Rice Institute of NAAS of Ukraine during flooding or drip irrigation. Grain samples were digested for analysis by microwave sample preparation in nitric acid on Milestone Start D. The content of inorganic elements was determined by ICP-MS method on Agilent 7700x in helium flow mode. Calibration solutions from Inorganic Ventures, USA were used.Results. Compared to flood irrigation, the introduction of drip irrigation leads to a 2.3–3 times decrease in the accumulation of arsenic in the grain. The increase in cadmium and strontium accumulation was found. Drip irrigation also increases the accumulation of trace elements in grain – components of redox systems of plants (copper, zinc, manganese). A slight decrease in iron content is probably associated with the activation of mechanisms for blocking the inflow and reuse of arsenic into the grain. The yield of rice varieties was higher during flooding. In the case of ‘Viscount’ and ‘Consul’, it was 9.35 and 11.76 t/ha in the case of flooding, and 6.80 and 9.30 t/ha in the case of drip irrigation, respectively. The content of inorganic elements/ ash content is significantly lower in the variety ‘Consul’. This is probably due to the dissolution of elements in the biomass with high productivity of this variety. Conclusions. The natural contamination of rice crops with arsenic limits the nutritional value of the crop. The introduction of drip irr igation of r ice crops signif icantly reduces the accumulation of highly toxic arsenic in the grain, which is especially important for children food. The increase in cadmium and strontium accumulation determined by drip irr igation leads to high equirements for the quality of phosphate fer tilizers used in crop cultivation echnologies. Introduction of drip irr igation optimizes the aerobic conditions of ion supply, which leads t o i nc r ea s ed accumul at i on of t r ace e l ement s – components of redox systems of plants. The only exception is a slight decrease in iron content , which is probably associated with the activation of mechanisms of inhibition of the inflow of arsenic to the grain of rice. At the same time, there is a slight decrease in the productivity of crops. Thus, under drip irr igation there is an increase in the accumulation of biologically important metals and a decrease in the accumulation of highly toxic arsenic.

Study of nitrogen use efficiency and yield of rice influenced by deep placement of nitrogen fertilizers

Continuous increase of nitrogen fertilizer use adversely affecting the soil health as well as the environment. It necessitates the systematic study of the impact of nitrogen (N) fertilizer use-reduction on crop yield. In this article, the effects of deep placement of nitrogen fertilizers on nitrogen use efficiency (NUE) and yield of rice variety “BRRI dhan46” were investigated and compared for three N formulations: urea super granule (USG), NPK briquettes and prilled urea (PU). The experiment was conducted in randomized complete block design (RCBD) with eight N treatments replicated three times. The treatments were applied by varying doses (0, 52, 78 and 104 kg ha-1) of nitrogen fertilizers in a known identical soil and weather condition. Applications of PU, USG and NPK briquettes exhibited significant differences on yield attributes of rice. Results revealed maximum grain yield of 6.391 t ha-1 (54% increases over control) for the dose USG 104 kg ha-1 which is statistically similar to the dose USG 78 kg ha-1 and NPK briquettes 104 kg ha-1. The deep placement of USG and NPK briquettes enhanced both the recovery of applied N and N use efficiency compared to broadcast application of prilled urea. However, USG 78 kg ha-1 showed maximum apparent N recovery, N use efficiency, gross margin and marginal benefit-cost ratio. Thus, an application of 78 kg ha-1 USG can be recommended for profitable cultivation of rice variety BRRI dhan46.
 SAARC J. Agri., 17(1): 93-103 (2019)

Changes in microbial biomass and grain yield of rice varieties in response to the alternate wet and dry water regime in the inland valley of derived savanna

This investigation tested the hypothesis that the alternate wet and dry (AWD) water regime would increase soil microbial biomass carbon (MBC), microbial biomass nitrogen (MBN) and microbial count. Variations in MBC, MBN and grain yield could be due to varietal differences in a derived savanna. Experiments (both pot and field ones) were conducted at the Federal University of Agriculture, Abeokuta (Latitude 7? 12? to 7? 20? N and Longitude 3? 20? to 3? 28? E), Nigeria in 2015. In both trials, the treatments consisted of water regimes (continuous flooding [control] and AWD imposed on lowland rice varieties [NERICA?L-19])and Ofada [local check] at the vegetative growth stage in three cycles. The design in both trials was a completely randomised and randomised complete block design for the pot and field experiments respectively, with three replicates. In the screen house, MBC and MBN were significantly higher in AWD than in continuously flooded soil, especially at the beginning of the AWD cycles. This could have caused nutrient pulses to sustain the improved performance of lowland rice under AWD. A converse pattern was observed in the field in the third cycle. Ofada rice had a significantly higher microbial count and MBC (cycle 1) than NERICA L-19, however, a converse pattern was observed in MBC (cycles 2 and 3) and MBN (cycle 1). Composition of their rhizodeposition and timing of cycles could explain the observed varietal differences in MBC and MBN.

Influence of whole and sub soil salinity on growth, development, physiology and yield of selected rice varieties cultivated in Jaffna district, Sri Lanka

Growth and yield reduction of rice is a serious issue in salinity prone areas of the world. Rice yields decrease by 12 % for every unit (dSm -1 ) increase in EC above 3 dSm -1 . Salt in different soil depths influence the yield by interfering growth, development and physiology of plants. Impact of sub and whole soil salinity levels on yield are necessary for adapting salinity mitigation management practices. Study was carried out to identify the influence of whole and sub soil salinity levels on growth, development, physiology and yield of selected rice varieties cultivated in Jaffna district of Sri Lanka for salt tolerance. Experiment was conducted in the poly-tunnel of the Department of Crop Science, Faculty of Agriculture, University of Peradeniya during the period from June to November, 2014. Experiment was conducted as two factor factorial (varieties and depth of salinity of soil column) in completely randomized design with three replicates. Plant height, SPAD reading, shoot root ratio, root length, sodium potassium ratio, thousand grain weight and yield were measured. Data were analysed using Proc ANOVA procedure followed by the LSMEANS procedure for mean separation. Growth and yield of rice varieties were significantly affected under sub and whole salinity conditions. Within the same salinity levels, sub soil condition (top15cm normal soil and rest 45 cm saline soil) showed better performance in all parameters tested than whole soil salinity conditions (up to 60 cm saline soil). With the increased soil electrical conductivity, growth and yield reduction was observed in all tested varieties both in sub and whole soil salinity levels. Among the varieties, Pachaperumal showed the highest yield and tolerant to higher salinity levels followed by Adakari.

UJI ADAPTASI BEBERAPA VARIETAS PADI SAWAH (Oryza sativa L) DAN KAPUR DOLOMIT PADA TANAH GAMBUT

Adaptation test of several rice varieties and dolomit lime on peatland was carried out in the greenhouse of Faculty of Agriculture Riau Islamic University Pekanbaru. The purpose of this research ws to know adaptation power several yielding rice varieties on peatland with using dolomit and to obtain yielding rice varieties which is able to adapt with peatland, and to find a correct dosage by using doomit lime for raise pH soil. The experiment was arranged with grouply randomized design with two factors. The first factor was yielding rice varieties, consisting of four factors: V1 (IR 64), V2 (IR-72), V3 (Kapuas), and V4 (Santani). The second factor was dolomit lime, consisting of four factors: d1 (2.56 t/ha) and PH 5.6, D2 (3.60 t/ha and pH 5.4, D3 (4.51 t/ha) and pH 5.2, and D4 (5.49 t/ha) and pH 5.0. The parameter observed were plant height, number of productive shoot, percetage of unhask full rice, weight of dry rice per hectare, and weight of 1000 seeds. The resuts showed interaction using several yielding rice varieties was not significant effect on the observed parameters. However, the use of yielding varities showed a significant effect with the best variety: V1 (3.9 t/ha), V2 (3.8 t/ha), V3 (3.1 t/ha), and V4 (3.1 t/ha). While, the use of dolomit lime was affected significantly for the whole parameters with the best parameter: D1 (3,6 t/ha), D2 (3,6 t/ha), D3 (3,4 t/ha), and D4 (3,3 t/ha).

Effect of seedbed solarization on plant growth and yield of two rice varieties–BR11 and BRRI Dhan33

An experiment was carried out at RDRS Farm in Rangpur during the 2014 T. aman rice season to determine the impact of seedbed solarization on plant growth and yield of rice varieties, BR11 and BR33. Solarization was achieved by covering the seedbeds with transparent polythene sheet for four weeks prior to sowing. Seedlings of both varieties were raised on solarized and non-solarized seedbeds and later transplanted into the main field for comparison of growth and yield. Emergence, seedling height and weight, root length and weight were higher with seedlings raised on solarized seedbeds compared to seedlings from non-solarized seedbeds. Also root knot nematode galls decreased significantly on seedlings from solarized seedbeds compared to those from non-solarized seedbeds for both the varieties tested. The increase in height and weight of solarized seedlings enabled easy access for uprooting and transplanting seedlings in the main field within the recommended 20-25 days after sowing. When transplanted in untreated main fields, plants grown from the solarized seedlings of both the rice varieties had significantly less infestation of stem borer as compared to non-solarized plants. Grain yields obtained from solarized seedlings were 7% higher for BR11 and 9% higher for BR33 relative to normal seedlings.J. Bangladesh Agril. Univ. 15(1): 55-59, January 2017

Effect of Sowing Method and Seeding Rate on Yield and Yield Components of Rainfed Rice (<i>Oryza sativa</i> L.) Varieties in Woliso, South-West Shoa Zone, Ethiopia

A field experiment was conducted on a farmer’s field in Woliso District of Oromia Region to determine the effect of sowing method and seeding rate on growth, yield components and yield of rice varieties under rainfed conditions. Factorial combinations of three varieties (X-jigna, Gumera and Superica-1), two sowing methods (broadcast and row planting) and three seeding rates (75, 100 and 125 kg/ha) were laid out in Randomized Complete Block Design with three replications. Analysis of variance showed significantly higher difference among varieties for productive tillers, higher grain yield and total biomass. Significantly higher number of tillers at maturity and productive tillers/0.5m² as well as higher grain yield and total biomass/0.5m² were produced by Gumera. On the other hand, significantly greater grain yield/ha was produced by Gumera than that of Superica-1 and X-jigna. The effect of sowing method was non-significant on the growth parameters, yield and yield components of rice plants. Significantly greater grain yield/ha was obtained at seeding rate of 100kg/ha than 75 and 125 kg/ha. Hence, based on this experimentation, Gumera at seeding rate of 100kg/ha with broadcasting or row planting method recommended for Woliso areas.