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Arora R.K.,Central Potato Research Station | Sharma S.,Central Potato Research Institute | Singh B.P.,Central Potato Research Institute
Potato Journal | Year: 2014

Late blight caused by Phytophthora infestans is one of the most dreaded diseases of potato worldwide and cause significant loss in production. The pathogen is highly variable and adapt to the newly bred varieties and fungicides. Population of P. infestans in most of the countries has changed dramatically and original A1 has almost been displaced by more virulent A2 strain. In India, A2 mating type was recorded in 1990s and now it has displaced the A1 in temperate highlands while in sub-tropical plains still A1 is dominating. Virulence to all major resistance genes has been recorded and in India the racial complexity has reached to its zenith resulting in breakdown of many disease resistant varieties. Indiscriminate use of metalaxyl based fungicides has led to the development of metalaxyl resistance world over including India, which has necessitated the use of additional systemic molecules for the management of this disease. The population of P. infestans characterized using molecular markers has led to better understanding of pathogen at molecular level. Mitochondrial DNA haplotyping of P. infestans has revealed that mt Ia is displacing the other haplotypes globally at a faster rate including India. Relationship between P. infestans and the weather is well understood and has been utilized for developing disease forecasting models and decision support systems across the globe including India. An increasing severity of late blight in many potato growing areas, a shift in pathogen population toward increased specific virulence and an increasing tolerance to the most effective late blight specific fungicides suggests a need to develop an appropriate disease management strategy based on information technology.

Singh S.K.,Central Potato Research Station | Lal S.S.,Central Potato Research Institute
Potato Journal | Year: 2012

A field trail was conducted during winter season of 2009-10 and 2010-11 at Central Potato Research station, Patna on sandy loam soil under irrigated condition to find suitable dose of potassium for potato cultivar Kufri Pukhraj for optimum yield, quality and nutrient use efficiency under different nitrogen levels. There was significant positive interaction between N and K. At each level of N, increasing levels of K application increased the tuber yield, N and K uptake by potato at harvest. Potassium and N application improved tuber size by increasing the large and medium grade yield and decreasing the small and very small sized tuber. Maximum yield of 39.83 t /ha was obtained when N and K was applied @ 225 kg/ ha and 150 kg K2O/ ha against a tuber yield of only 14.36 t/ ha without N and K application. The recovery efficiencies of K and N fertilizer on potato increased at 100 kg K2O and 150 kg N/ ha. There was less weight loss and rottage of tubers with potassium application whereas with increase in nitrogen levels there was increase in weight loss due to tuber rottage.

Kumar M.,Central Potato Research Institute | Trehan S.P.,Central Potato Research Station
Potato Journal | Year: 2012

The field experiment was conducted to quantify the contribution of different organic amendments to N nutrition to potato cultivars of varying efficiency during winter season of 2006-07 and 2007-08 at Central Potato Research Station, Patna, India. All possible combinations of two varieties viz., Kufri Jyoti and Kufri Pukhraj, four nitrogen levels (0, 80, 160 and 240 kg/ha) and five organic amendments (control, rice straw @ 10 t/ha, farm yard manure @ 10 t/ha and 20 t/ ha and in situ green manuring with Sesbania aculeata) were replicated thrice in factorial randomized block design. Kufri Pukhraj was better yielder, agronomically more efficient, required less N to produce a given fixed yield in the presence of different organic amendments and derived higher per cent of its N nutrition from organic amendments. This cultivar also showed higher optimum yield level in the presence of all organic amendments and was more eco-friendly with respect to fertilizer N. Green manure added highest amount of N and showed highest efficiency. Kufri Pukhraj utilized more N from green manure and FYM and showed better efficiency than Kufri Jyoti. N equivalent of different organic amendments varied with tuber yield level and it was highest for green manure followed by FYM in both the cultivars. Optimum yield level, net return and benefit cost ratio were also higher for green manure followed by FYM.

Kumar R.,Central Potato Research Station
Indian Journal of Genetics and Plant Breeding | Year: 2014

Six Tuberosum and five Andigena parents were used to generate 23 Tuberosum × Andigena direct and 23 reciprocal progenies. These progenies were evaluated for total yield, marketable yield, tuber number, average tuber weight and per cent tuber dry matter in second and third clonal generations. Evaluation of progenies in field was done in Randomized Complete Block Design with split plot taking direction of cross (Andigena versus Tuberosum as female) as sub-plot and parental combination as main-plot. Significant variation was recorded in progenies for the characters studied. Results revealed that that reciprocal cross differences in inter group crosses were in general not significant for all the characters. The lack of reciprocal cross differences in short-day length environment in Indian plains shows that crosses can be attempted in either direction while breeding cultivars for Indian plains. © 2014, Indian Society of Genetics and Plant Breeding. All rights reserved.

Singh S.K.,Central Potato Research Station | Lal S.S.,Central Potato Research Institute
Potato Journal | Year: 2011

A field experiment was conducted at Patna from 2005-06 to 2007-08 on clay loam soil under Trans Gangetic plain to evaluate the effect of four fertility management schedules viz. application of recommended dose of fertilizer to all the crops in the system either alone or in combination with in situ crop residue incorporation in all the crops in the system, in situ green manuring with Sesbania in rice and FYM @ 10 t /ha applied only to winter crop of potato, on productivity and resource use efficiency in three potato based cropping systems viz. potato (Solanum tuberosum L.) - greengram (Vigna radiata L) - rice (Oryza sativa L.), potato-maize (Zea mays L)-rice and potato-onion (Allium cepa L)-rice. Maximum production (60.24 t/ ha), net returns (98,990/ha), B:C ratio (1.13), production efficiency (190.99 kg/ha/day) and monetary return efficiency (313.6/ ha/day) were recorded in potato-onion-rice cropping system. Potato-greengram-rice cropping system recorded highest value of sustainable yield index, organic C, available N and P in the soil. Green manuring of Sesbania in the cropping system resulted in maximum production, land use efficiency, organic C, available N, P and K in soil, while application of FYM @ 10 t/ha to potato crop in the system resulted in highest net returns, B:C ratio, production efficiency, monetary return efficiency and sustainable yield index.

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