Nutrient interaction study in rice (Oryza sativa L.) in acidic soil under high rainfall with inorganic fertilization sources

Abstract

The physicochemical and biological properties modify the nutrient interaction to a great extend. Hence, the study was conducted by involving two level of nutrient application (through inorganic fertilizers) of each nitrogen (N) (N0 and N1 represent 0 and 80 kg N/ha) phosphorus (P) (P0 and P1 indicates 0 and 26 kg P/ha) and lime (Calcium (Ca)) (Ca0 and Ca1 indicates 0 and 2.5 t/ha lime) in rice (DRR-42 and DRR-46) to find out the nutrient interaction. The result showed that, there was no any synergistic and additive interaction among N, P and Ca; while combined application of N and P and N and Ca was slightly superior growth and yield attributes than their individual effect and will be considered as possible interaction for investigation in acidic soils. Among the nutrients, the order of significance in affecting the growth is N>P>Ca (lime); while among nutrient interaction the order of significance were combined application of N, P and Ca (lime) > combined application of N and P > combined application of N and Ca > combined application P and Ca (lime) in both rice varieties. The shy crop due to nutrient stress arose as a result of leaching of soluble nutrients, fixation in non-available form and low soil inherent nutrient content are the possible reason for hiding complete expression of nutrient interaction. Among rice varieties DRR-46 respond better than DRR42 to nutrient application in terms of all growth and yield attributes studied.