Vol. 10, Issue 9 (2021)

Author(s):
Chitla Sai Srujan, HH Patel, Lokesh R, YB Madagoudra and Prakash Terin

Abstract:
A field experiment was conducted at College Farm, N. M. College of Agriculture, Navsari Agricultural University, Navsari to study the effect of irrigation and nitrogen levels on Grain Amaranth (Amaranthus hypochondriacus L.). The treatments consisted combinations of four levels of irrigation viz., 30 DAS (I₁), 30 DAS + 60 DAS (I₂), 30 DAS + 60 DAS + 75 DAS (I₃) and 0.8 IW: CPE (I₄) and three levels of nitrogen ie., 50% RDN (N₁), 75% RDN (N₂) and 100% RDN (N₃). Nitrogen, Phosphorus and Potassium content in grain and straw were determined by Modified Kjeldahl’s method, Vanadomolybdo phosphoric acid colorimetric method and Flame photometric method, respectively. Nutrient content was multiplied by yield to calculate nutrient uptake (kg ha^-1). Available N, P₂O₅ and K₂O were determined by alkaline permanganate method, Olsen’s method and Flame photometric method, respectively. Fertilization with 100% RDN had a significant effect on nitrogen content in grain and straw, while P and K content remained non-significant. Irrigation and Nitrogen levels had a significant effect on nutrient uptake. Significantly higher nutrient uptake was observed under 30 DAS + 60 DAS + 75 DAS (I₃) and 100% RDN (N₃). The available soil N, P2O5 and K2O remained non-significant.