Yield Components Of Potato Research Articles

Response of Potato (Solanum tuberosum L) Varieties to Blended NPSZnB and Potassium Chloride Fertilizers Rates at Assosa District, Western Ethiopia

Potato production is constrained by a number of biotic and abiotic factors, among which poor soil fertility is the prime one. Thus, the objectives of the study were to evaluate effect of NPSZnB plus potassium chloride rates fertilizer on growth performance, yield and yield components of potato and to determine optimum fertilizer rate and economically feasible for potato production at target Assosa areas. The experiment was laid out in RCBD with split plot arrangement with three replications. Two potato varieties, Belete and Gudane were assigned to main plot whereas six blended NPSZnB with potassium chloride fertilizers rates assigned to subplots. Totally, the experiment had twelve treatments. The interaction effects of blended NPSZnB and potassium chloride fertilizers rates not significantly (P>0.05) influenced marketable yield, unmarketable yield and total tuber yield. However, the main effects of blended NPSZnB and potassium chloride fertilizers rates were highly significantly (P<0.01) affected marketable tuber yield. The partial budget analysis was revealed that highest net benefit with acceptable marginal rate of return (1027.27%) was obtained with the application of NPK (110 kg N + 90 kg P2O5 + 69 kg K2O ha-1) fertilizers. We conclude that application of NPK (110 kg N + 90 kg P2O5 + 69 kg K2O ha-1) fertilizers were economically feasible to recommend for potato production in the study area.

Effects of Blended NPSB Fertilizer Rates on Growth, Yield and Yield Components of Potato (Solanum tuberosum L.) Varieties in Miserak Badawacho District, Hadiya Zone, Southern Ethiopia

Background: Macro and micronutrients are the most limiting factors in the production of potato in most part of the country. Therefore, this study was conducted to determine the effect of blended NPSB fertilizer rates on yield and yield components of potato varieties in Hadiya zone, Southern Ethiopia in 2021-2022 cropping season. Methods: The experiment was conducted as a factorial combination of five levels of blended NPSB fertilizer rates (0, 100, 150, 200, 250 kg ha-1) and four potato varieties in randomized complete block design (RCBD) with three replications. Data collected on growth, yield and yield-related traits were subjected to analysis of variance. Result: The results of the study revealed that variety and blended NPSB fertilizer showed a significant effect on crop phenology, growth, tuber yield and yield components. The interaction effect of variety and blended NPSB fertilizer also showed a significant effect on most of the traits measured except for days to 50% flowering and unmarketable tuber yield. The variety Belete showed the highest marketable tuber yield and total tuber yield with the application of 200 kg ha-1 NPSB fertilizer rate followed by variety Gudene). In terms of economic performance, 150 kg ha-1 NPSB fertilizer was found to show the marginal rate of return acceptable net benefit in variety Belete. Therefore, potato-growing farmers are advised to apply 150 kg ha-1 of NPSB fertilizer to grow Belete variety. In addition, Gudene variety at 250 kg ha-1 NPSB fertilizer application rate was found to show the highest marginal rate of return and net benefit can be considered as an alternative recommendation to increase the productivity of potato in the study area.

Effect of combined application of organic manure and nitrogen fertilizer rates on yield and yield components of potato: A review

Effect of combined application of organic manure and nitrogen fertilizer rates on yield and yield components of potato: A review

Yield and yield quality characteristics of two varieties of sweet potato under different watering intervals ​

Climate change significantly impacts sweet potato production because of the high potential for drought conditions. Understanding the regional impacts of climate change on the irrigation interval is important for effective water resource management. This study aims at determining the influence of the irrigation interval on the drought tolerance responses of two new sweet potato varieties from Universitas Padjadjaran. The experiment was arranged in a randomized block design (RBD) with two factors. The first factor was two varieties of sweet potato i.e. Awachy-1 (Orange-Fleshed) and Biang (Purple-Fleshed); and the second factor was the irrigation interval (1, 3, 5 and 7 days). This research was conducted in a screen house of Ciparanje experimental field station, Universitas Padjadjaran Jatinangor. Experimental results showed no interaction between the irrigation intervals and the varieties on the sweet potato's yield components and nutritional content. Biang provided the most optimal result regarding the number of tubers and dry mass, despite being watered once every three days. Biang also produced a higher number of tubers, shorter sweet potato length and higher dry weight than Awachy-1 in every irrigation interval. Biang also showed a higher value for nutritional content than Awachy 1 on total soluble solids, sugar and carbohydrate content. The optimal water usage to store the root yield of Biang and Awachy-1 is one to three days of irrigation intervals on the sweet potato’s tuber diameter and the plant's dry weight. However, the irrigation interval that most significantly improved the weight of the tuber was one day, while the increased nutritional content of the tuber was three days. Biang and Awachy-1 cultivars could survive under drought conditions, although some yield components had decreased. These results suggested that the varieties or watering interval affected sweet potato growth and yield components.

Yield Components of Potato [Solanum tuberosum (L.)] and Their Relationship with Tuber Yield

Background: Tuber yield in potato is a function of positive association of tuber related traits. Understanding the interplays of these traits is useful for a meaningful selection process and tuber yield improvement. Methods: Field experiment was conducted in 2017-18 and 2018-19 dry seasons at Teaching and Research Farm of Faculty of Agriculture, Bayero University, Kano and Teaching and Research Farm of Kano University of Science and Technology, Wudil to assess the relationships of yield related characters and their contribution to-tuber yield in potato. Treatments comprised of five planting times (late October, early November, mid-November, late November and early December), two methods of propagation (whole seed and cut seed) and three plant densities (66,666; 43,333 and 33,333) per hectare. These were combined and laid down in an incomplete-block design; in fractional factorial using D-optimality criterion. Simple and partial correlation analysis was carried out to determine the relationships, direct, indirect and combined contributions of the measured variables to tuber yield. Result: Tuber yield, average tuber weight (g), number of tubers per plant and marketable tuber were positively correlated to tuber yield. Significant but negative correlation between number of non-marketable tubers and tuber yield was also observed. The direct, indirect and combined contributions of average tuber weight (g), number of tubers per plant, number of marketable and non-marketable tubers indicated significant improvement in tuber yield.

Effects of Irrigation Interval, Irrigation Frequency and Growth Medium on Growth and Yield Components of Potato

Effects of Irrigation Interval, Irrigation Frequency and Growth Medium on Growth and Yield Components of Potato

Supplemental Nitrate Composition of Ca and Mg Liquid Fertilizer Application on Potato <i>(Solanum tuberosum L.)</i> to Increase Tuber Yield in Tiyo District of Arsi, Ethiopia

Field experiments were conducted at Kulumsa station of Tiyo district, southeastern Ethiopia in 2017 and 2018 off-season, to test the effect of fertilizer products on yield and yield components of potato and to evaluate the possibility of incorporating the products into input system for agricultural production. The treatment set up were 1) No input (negative control), 2) recommended rate of fertilizer (RNP) (111, 39 and 16.5 Kg ha^-1 N. P and S, respectively) from NPS and Urea, 3) RNP + 1.8 L ha^-1 LF; 4) RNP + 3 L ha^-1 LF, and 5) RNP + 4.2 L ha^-1 LF on growth performance and yield. The results showed that treatment effects were significant for potato total and marketable tuber yields. Since the effect of fertilizers on the yield of potato was consistent across seasons in Kulumsa station, combined analysis has been conducted. The highest total (46.1 t ha^-1) and marketable (42.2 t ha^-1) tuber yields were recorded with the application of recommended fertilizer (RNP) + 1.8 L ha^-1 LF and (RNP) + 3L ha^-1 LF. This treatment was even statistically superior to application of RNP alone. Compared to the control and RNP treatments, application of inorganic fertilizers with 1.8 L ha^-1 LF gave 23.4 and 14.1% more total tuber yield of potato, respectively. Similarly, RNP + 3.0L ha^-1 LF gave 20.9 and 13.7 % more marketable tuber yield of potato over the control and recommended fertilizer from inorganic sources (NPS and urea) treatments, respectively. The result further showed that application of 1.8 L ha^-1 LF with RNP fertilizer gave total and marketable potato tuber yields which is statistically at par with yields obtained from NPS plus 3.0 L ha^-1 LF. The lowest total (35.3 t ha^-1) and marketable (33.4 t ha^-1) tuber yields of potato were harvested from the plots that received neither inorganic nor fertilizers. Therefore, integrated application of liquid fertilizer along with full dose of inorganic fertilizers has been recommended for increased productivity of potato in the south-eastern highlands of Ethiopia.

Evaluation of Liquid Potassium Fertilizer on Yield and Yield Components of Potato Under Irrigation on Nitisols in Central Highlands of Ethiopia

Nutrient deficiency is a major constraint for potato ( S olanum t u berosum L.) production in Ethiopia. Potato response to potassium fertilizer declined with widespread deficiencies of nutrients other than N and P, farmers are discouraged to apply such fertilizer recommendations. This study was, therefore, conducted for two years (2018-2019) on nitisols under irrigation to evaluate the response of potato to liquid potassium (K) fertilizer rates. The treatments were five (Negative control, recommended NPS, recommended NPS, recommended NPS + 3liter liquid K /ha, recommended NPS + 5 liter liquid K/ha, recommended NPS + 7liter liquid K/ha). The experiment was arranged in a randomized complete block design replicated four times on farmers’ fields. Results revealed that potato yield responded differently to the applied potassium fertilizer rates. Applications of 100% NP fertilizer with 5liter/ha liquid potassium fertilizer had a significant (p<0.05) effect on marketable tuber and total tuber yield of potato. In general application of liquid potassium fertilizer (100% NP fertilizer with 5liter/ha liquid K) indicates positive response on dray matter and specific gravity. In conclusion, based on the findings of the experiment with application of 5L/ha liquid potassium fertilizer with 100% recommended NP fertilizer are economically optimum for potato production. DOI: 10.7176/JBAH/11-22-01 Publication date: November 30 th 2021

Response of sweet potato yield components to stakes angle and mulch type: Sweet potato cultivation in the Papua highlands

This study aims to improve the ability of sweet potato plants to obtain photosynthetic active radiation through a combination of stake angle with mulch as a reflector. The experiments were arranged in a separate plot design with three replications. The main plot consisted of Cangkuang variety with 90° stakes and Cangkuang varieties with 60° stakes. The subplots consisted of no mulch, straw mulch, white sand mulch, clear plastic mulch, and black silver plastic mulch. The results showed that the use of mulch as a reflector on both stake angle was able to increase photosynthesis active radiation by 27.84% to 34.63% compared to without mulch at 16.82%, and the optimum leaf area index at the age of 100 DAP was 3.74 to 4.45 at stake angle of 90° and 3.23 to 4.10 at stake angle of 60°. The number of tubers per plant increased and reached the highest of 3.17 and 4.50 in straw mulch, the number of marketable tubers from 51.90% to 59.23% compared to without mulch of 41.97% for stakes angle of 90° and 44.67% to 65.83% compared without mulch of 32.47% for stakes angle of 60°.

Determining the rate of blended fertilizers and urea for potato production under rainfed condition in Jeldu, West Showa, Ethiopia

This experiment was conducted to determine the rate of blended fertilizers and urea for potato production under rainfed condition in Jeldu, West Showa, Ethiopia. Different fertilizer treatments viz., 150 kg ha-1 NPSB+80 kg ha-1 urea, 250 kg ha-1 NPSB+80 kg ha-1 urea, 350 kg ha-1 NPSB+80 kg ha-1 urea, 150 kg ha-1 NPSB+140 kg ha-1 urea, 250 kg ha-1 NPSB+140 kg ha-1 urea, 350 kg ha-1 NPSB+140 kg ha-1 urea, 150 kg ha-1 NPSB +200 kg ha-1 urea, 250 kg ha-1 NPSB +200 kg ha-1 urea and 350 kg ha-1 N+200 kg ha-1 urea was used for the production of Belete and Gudenie potato varieties (cv. Jeldu Wereda) during 2018-2019 using RCBD factorial arrangement in three replication. This study revealed that there was a highly significant difference between the yield and yield components of potato due to the main effect of fertilizer rates. The interaction did not significantly affect any parameter of potato during the study. The highest total and marketable yields (22.95 t ha-1 and 20.06 t ha-1), respectively were harvested from 350 kg ha-1 NPSB+200 kg ha-1 urea though not significantly different from total and marketable yield of 250 kg ha-1 NPSB+200 kg ha-1 urea (22.08 and 19.14 t ha-1) and 350 kg ha-1 + 140 kg ha-1 urea (21.65 and 18.84 t ha-1), respectively. The partial budget analysis indicated that the highest benefit (64,916.00ETB) was fetched from 350 kg ha-1 NPSB+200 kg ha-1 urea followed by 250 kg ha-1 NPSB+200 kg ha-1 urea (63,004.00ETB) while the highest marginal rate of return (19,430.00%) was recorded from 250 kg ha-1 NPSB+200 kg ha-1 followed by 150 kg ha-1 NPSB+200 kg ha-1 urea (17,000.00%). From this, it can be concluded that the NPSB+ urea rates highly significantly affected the yield and yield component of potato. Thus, 250 kg ha-1 urea+200 kg ha-1 urea can be used for high yield and high economic return of potato in Jeldu district.

Yield and Yield Components of Potato (Solanum tuberosum) as Affected by Rock Phosphate in Standoff Soil, Southern Alberta Canada

An experiment was conducted in Standoff, Southern Alberta in April, 2020. The object of the experiment was to investigate effect of rock phosphate organic fertilizer on growth and yield of potato crop grown in Standoff. The varying levels of rock phosphate were broadcasted into the soil at control (0 P Kg ha-1), Low P level (50 P Kg ha-1) and High P level (100 P Kg ha-1). The basal application of urea inform of nitrogen fertilizer was applied at 280 N Kg ha-1. Potato seeds were planted at a distance of 30 by 90 cm. The three treatments were replicated three times, resulting into nine plants. One plant was taken out of uniformly grown tallest plant in each of the treatment to measure yield parameters. The yield parameters collected were subjected to analysis of variance (ANOVA) using Duncan’s Multiple Range Test (DMRT) for separation of means. Results of the experiment indicated that High P and Low P rock phosphate fertilizer levels positively influenced weight of potatoes at 76 and 112 Days after sowing (DAS), respectively while High P rock phosphate fertilizer level got highest number of potatoes than Low P and control at 76 DAS. Furthermore, High P rock phosphate fertilizer level and control plots supported marketable number of potatoes at 76 DAS while High P rock phosphate fertilizer level favoured unmarketable number of potatoes at 112 DAS. It was quite obvious from the results that marketable weight of potatoes was positively influenced by High P rock phosphate level and Low P rock phosphate level at 76 and 112 DAS, respectively whereas unmarketable weight of potatoes was affected by High P rock phosphate fertilizer level at 112 DAS. These results revealed the beneficial use of rock phosphate for potato crop production

Response of potato cultivars to the northern root-knot nematode, Meloidogyne hapla, under field conditions in New York State, USA

Summary In New York and the Northeastern USA, the northern root-knot nematode, Meloidogyne hapla, is an important soil-borne pathogen of potato. The economic threshold for M. hapla in potato production has been 100 second-stage juveniles (J2) (100 g soil)−1, and is often used to dictate the need for prophylactic nematicides. However, the response of newer, popular potato cultivars under field conditions to M. hapla is unknown. The relationships between initial and final M. hapla populations and potato yield components in the popular cultivars ‘Genesee’, ‘Eva’ and ‘Lamoka’ were evaluated in three commercial production fields in New York, in 2016 and 2017. Following manual extraction from soil samples, M. hapla populations were quantified. Additionally, a glasshouse bioassay was performed to estimate M. hapla populations and correlate tuber yield. Populations of M. hapla over both years ranged from 0 to 519 J2 (100 g soil)−1 at the initial sampling, and from 0 to 10 294 J2 (100 g soil)−1 at the final sampling time. No significant correlation was observed between initial M. hapla populations and tuber yield, or between bioassay plant galling severity and tuber yield, among the cultivars included in the study in either year of the study. Yet correlations between bioassay plant galling severity and M. hapla populations were significant in both years, indicating the bioassay was adept at estimating M. hapla populations. These results will aid in directing future investigations into tolerance to M. hapla and nematode management.

Assessment of physiological age and antioxidant status of new somatic hybrid potato seeds during extended cold storage

Yield components of potato are largely affected by the physiology age of the tuber seeds at planting. The current study focuses on monitoring seed tuber aging in two CN1 and CN2 somatic hybrid lines and Spunta (Sp) variety during 270 days of storage at 4 °C. Aging rate was monitored based on sprouting, emergence and tissue oxidation rates. Investigation of sprouting parameters such as physiological age index (PAI) considering physiological and chronological age and the incubation period (IP) indicated lower physiological age in hybrids than in Sp during the storage. Moreover, these analyses showed that off-seasonal growing conditions increased the aging, more clearly, in Sp tubers than in hybrid ones. However, dormancy periods (endodormancy and after storage dormancy) were equivalent in the different tuber lots. PAI and IP data when combined with those from emergence parameters (duration until emergence and stem number) seem more efficient for the characterization of the different potato lines. However, emergence indicators, when considered separately, were not able to distinguish clearly between seasonal and off-seasonal tubers. Data suggest that hybrid seeds exhibited high performances since they produced higher stem number per plant than Sp. The high aging rate in Sp tubers seems to be associated with the few developed stems. Biochemical analyses supported in part morphophysiological differences between hybrids and Sp seeds although these indicators seem more sensitive to aging. Indeed data showed that the dormancy break, and then, the development were associated with some level of tissue oxidation. Antioxidants such as superoxide dismutase (SOD), catalase (CAT), glutathione peroxidase (GPX) and carotenoids seem more enhanced after the release of dormancy. However, induction of these activities started earlier in off-seasonal tubers than in seasonal ones, this was consistent with their advanced aging level revealed by PAI and IP data. Activation of these antioxidants appears to respond effectively to the increase of ROS suggesting a better control of postharvest development and tissue deterioration especially in CN2 off-seasonal tubers. This study suggests that CN2 followed by CN1 exhibited the best performance compared to Sp variety.

Effects of Blended NPS Fertilizer Rates on Yield and Yield Components of Potato (Solanum tuberosum L.) Varieties at Dessie Zuria District, Ethiopia

In Ethiopia, the average yield of potato is far below the potential due to different problems like in appropriate agronomic practices. Hence, this research was done to evaluate the effects of NPS fertilizer rates on yield and yield components of potato. The study was conducted at Dessie Zuria district, Ethiopia during dry season of 2015. A factorial combination of six level of NPS fertilizer (0:0:0, 111:89.7:0, 111:89.7:16.52, 55:89.7:16.52, 111:44.85:8.26 and 55:44.85, 8.26) kg ha-1 and two potato varieties were plotted in Randomized Complete Block Design with three replications. The highest plant height of potato (87.60 cm) was recorded on 111: 89.7:16.52 kg ha-1 of NPS fertilizer rate. Belete variety supplied with 111: 89.7:16.52 kg ha-1 of NPS fertilizer rate recorded the maximum days (124.3) to maturity of potato. Similarly, Belete variety recorded the higher biomass than local variety. The 111:89.7:16.52 kg ha-1 and 55.5:89.7:16.52 kg ha-1 of NPS fertilizer rates showed the highest aboveground biomass (103.24 g hill-1) and underground biomass of potato (290.9 g hill-1) respectively. The highest average tuber number per hill (15.67), tuber weight per hill (1.82 kg), marketable (53.61 t ha-1), unmarketable (0.542 t ha-1) and total (54.15t ha-1) tuber yield were recorded on potato which was applied with 55.5: 89.7:16.52 kg ha-1 of NPS fertilizer rate. In all characteristics of growth and yield of potato, Belete variety was better than local variety. Similarly, potato fertilized with 55.5: 89.7:16.52 kg ha-1of NPS fertilizer rate was showed highest yield than other rates. Keywords: Potato; fertilizer rates; variety; marketable yield; tuber yieldDOI: 10.7176/JBAH/10-13-01Publication date:July 31st 2020

Evaluation of Potassium Fertilizer on Yield and Yield Components of Potato under Irrigation on Nitisols in Central Highlands of Ethiopia

Nutrient deficiency is a major constraint for potato ( S olanum t u berosum L.) production in Ethiopia. Potato response to potassium fertilizer declined with widespread deficiencies of nutrients other than N and P, farmers are discouraged to apply such fertilizer recommendations. This study was, therefore, conducted for two years (2018-2019) on nitisols under irrigation to evaluate the response of potato to potassium (K) fertilizer rates. The treatments were five (Negative control, recommended NPS, recommended NPS, recommended NPS + 3liter K /ha, recommended NPS + 5 liter K/ha, recommended NPS + 7liter K/ha). The experiment was arranged in a randomized complete block design replicated four times on farmers’ fields. Results revealed that potato yield responded differently to the applied potassium fertilizer rates. Applications of 100% NP fertilizer with 5liter/ha potassium fertilizer had a significant (p<0.05) effect on marketable tuber and total tuber yield of potato. In general application of liquid potassium fertilizer (100% NP fertilizer with 5liter/ha K) indicates positive response on dray matter and specific gravity. In conclusion, based on the findings of the experiment with application of 5L/ha liquid potassium fertilizer with 100% recommended NP fertilizer are economically optimum for potato production. Keywords : Liquid fertilizer, Nitisols, Potassium, Potato DOI: 10.7176/JNSR/10-12-02 Publication date: June 30th 2020

Effects of blended NPS fertilizer rates on yield and yield components of potato (Solanum tuberosum L.) varieties at Dessie Zuria district, Northeast Ethiopia

In Ethiopia, the average yield of potato is far below the potential due to different problems like in low soil fertility. Hence, this research was done to evaluate the effects of blended NPS fertil...

Performance of Potato (Solanum tuberosum L.) varieties Using True Potato Seed (TPS) at Gerado, Northeastern Ethiopia

Potato is one of economically important crop in Ethiopia. However, the average yield is far below the potential due to many challenges like lack of improved variety and quality seed potatoes. True potato seed is alternative seed source for potato production with many advantages, particularly where seed tubers is hampered by diseases. TPS used in Ethiopia, is negligible but it is likely to gain thrust in future particularly where quality seed tubers are either not available or expensive. Therefore, this study was conducted to evaluate the performance of potato varieties established by open-pollinated TPS seedling for yield and yield components. Eight potato varieties (Local, Bulle, Challa, Dagim, Gudanie, Jalenie, Shonkolla and Zengena) were established by open-pollinated TPS seedling for yield and yield components. The experiment laid in Randomized Complete Block Design with three replications. The results revealed that a significant variation in most traits was observed. The highest plant height (118.87cm) was recorded from Zengena. Bulle scored the highest marketable, unmarketable, total tuber number and marketable tuber yield per hill was 25.31, 26.03, 51.34 and 1.1117kg respectively. Local scored the highest tuber weight (1.2949 kg hill -1 ) and tuber yield (54.44 ton ha -1 ) but not significant different with Bulle, Gudanie, Dagim and Challa varieties due to its highest unmarketable tuber yield (0.3296 kg hill -1 ). The result of the study reviled that the open-pollinated potato varieties established through TPS have a great influence on yield and yield components of potato. Bulle variety has been recommended in all yield and yield components than others. Keywords : Potato, variety, Tuber number, Tuber yield, Tuber weight, True Potato Seed (TPS) DOI : 10.7176/JNSR/9-22-02 Publication date: November 30 th 2019

English

Phytophthora infestans is the major bottleneck in potato production in Ethiopia. Selection of appropriate planting time is highly location specific and the most important subject in rain-fed potato production. However, research recommendation on optimum planting time and fungicide application frequency for high lands area of Arsi (Kulumsa) is lacking. Thus, field experiment was carried out to evaluate the effect of planting time and fungicide application frequency on disease severity, yield and yield components of potato at Kulumsa during main cropping season of 2017. The treatments consisted of four planting time in the months of June and July and four fungicide application frequencies at the rate of 2.5 kg ha-1 of Ridomil Gold M.Z 68% W.P. Treatments were combined in 4 × 4 factorial arrangement and laid out in randomized complete block design with three replicates. Data on disease, tuber yield and yield components were analyzed using Statistical Analysis System Version 9.3. The interaction effect between treatments showed a highly significant (p<0.01) effect on disease incidence and area under disease progress curve and a significant (p<0.05) effect on percent severity index. Early planting in June produced significantly higher number of marketable and total tuber numbers per hill which were progressively reduced in subsequent plantings, whereas delay planting in July resulted in higher number of unmarketable tubers per hill. The interaction between early planting and different fungicide application frequencies gave the highest average tuber weight, marketable and total tuber yield per hectare. Therefore, the combination of early planting in June and twice fungicide application gave the optimum results in the study area. Key words: Disease incidence, fungicide, integrated disease management, potato tuber, production season. &nbsp

Relationships between yield and potato affected by different levels of bio-fertilizer "AL-ziest" Chemical Oral- Even

In order to evaluate yield and yield components of potato, affected by different levels of bio-fertilizer "AL-ziest" and chemical fertilizers Oral-Even factorial experiment in a randomized complete block design with two factors , the first factor of four level of bio-fertilizer "AL-ziest" (A1 = control, A2 = 100 ml, A3 = 150 ml, A4 = 200 ml), and the second factor in four levels of chemical fertilizer Oral-Even (B1 = control, B2 = 60 g; B3 = 80 g, B4 = 100 g) with three replications for foliar in Ardy village located in the city of Ardabil in 1393 was carried out. The results showed a correlation between: the number of main stems per plant and the number of tubers per plant, tuber weight per plant, total tuber yield and salable tuber yield and number of tubers per plant and the number of main stems per plant, tuber weight per plant and total and salable tuber yield was significant at probability level. Weight of tubers per plant and the number of main stems per plant, number of tubers per plant, tuber weight and total tuber yield and marketable had a significant positive relationship. As average tumor weight by weight of tubers per plant, total tuber yield and salable tuber yield significant at 1%. Total tuber yield and salable tuber yield with number of main stems per plant, number of tubers per plant, tuber weight per plant, tuber weight and a significant positive correlation indicates that the probability of a percent.

Effect of nitrogen sources on yield and yield components of potato (Solanum tuberosum) cultivars

An experiment was conducted during two consecutive summer seasons to evaluate the effect of nitrogen sources on yield and yield attributing characters of potato (Solanum tuberosum L.) cultivars. The experiment was laid out in a factorial randomized block design with four potato cultivars and three different nitrogen sources. The sources of phosphorous (P) and potash (K) were single super phosphate (SSP) and muriate of potash (MOP) respectively where the nitrogen (N) source is urea and di-ammonium-phosphate. In case of di-ammonium phosphate (DAP) it served source for both N and P. The pooled analysis showed significant difference between cultivars, nitrogen sources andits interactions on all characters studied. Our results revealed that application of recommended dose of N in the form of urea in both basal as well as top dressing significantly increased the vegetative growth. However, N 75% supplied in the form of DAP as basal and remaining nitrogen 25% in the form of ammonium sulphate as top dressing (T7)along with recommended dose of P and K and N 75% supplied in the form of ammonium sulphate as basal and 25%as top dressing (T2) along with recommended P and K resulted maximum marketable tuber yield in terms of tubernumber as well as weight. Therefore, for maximizing the marketable tuber yield N can be applied in the form of DAPand ammonium sulphate.