Nutrient Management In Rainfed Cotton

Abstract

Cotton crop growth follows a typical sigmoidal pattern (Fig.1). Dry matter accumulation is maximum during the active growth phase (40-100 days). Application of nutrients should be done well before the grand growth period between 45-60 days. Nutrient management in cotton is complex due to the simultaneous production of vegetative and reproductive structures during the active growth phase. The nutrient demand by the fruiting parts is very high. High nutrient demand at this stage results in reduction of root growth due to less partitioning of assimilates to the root and ultimately reduced capacity to absorb nutrients (Bassett et al., 1970) An excess of nutrient applied, especially N before the crop attains the grand growth period could revert the crop to putting up more of vegetative growth. A deficiency could result in hastening maturity. In a rainfed crop, water stress is not uncommon. It is another important variable which restricts the availability of nutrients and uptake.