Bio-mass Production in Potato in Relation to Evapotranspiration and Energy Summation Indices in Northern Hills of India |
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| Authors: | S Nagarajan N P Sukumaran P S N Sastry |
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| Institution: | Nuclear Research Laboratory, Indian Agricultural Research Institute, New Delhi—110012, India;Division of Agricultural Physics, Indian Agricultural Research Institute, New Delhi—110012, India;Division of Crop Physiology and Biochemistry, Central Potato Research Institute, Shimla—171001, India. |
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| Abstract: | In field experiments conducted for 2 consecutive years at Shimla (31°06'N, 77°10'E at 2202 m above mean sea level with potato ( Solarium tuberosum L.), weekly means of rainfall (P), potential evapotranspiration (PET), pan evaporation (PAN) and photosynthetically active radiation (PAR) were estimated during the crop season. It was evident that from April to end of June, the evaporative demand was more than the precipitation and that the crop suffered from water deficit from emergence to tuber initiation. Four different energy summation indices accumulated over important phenological stages of growth and energy-use efficiency in terms of biomass production at these stages were estimated for two seasons. Weekly cumulative biomass production showed a significant correlation with accumulated PET, PAN and PAR in the four genotypes tested in year 2. |
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| Keywords: | Biomass accumulation energy indices evapotranspiration Solanum tuberosum L |
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