Assessment of foliar spray of DAP on Yield and Yield attributes of rice in a vertisol of Chhattisgarh

Abstract

A field experiment was conducted during Kharif season, 2022 at Instructional cum Research farm, IGKV, Raipur, (C.G.) to study the assessment of foliar spray of DAP on productivity and nutrient uptake of rice in a Vertisol of Chhattisgarh. The experiment was laid out in a randomized block design with twelve treatments and replicated four times. Treatments included T1- N0-P0-K0, T2- N100-P0-K40, T3- N100-P60-K40, T4- N100-P15-K40 + 2% DAP two spray (20, 35 DAT), T5- N100-P15-K40 + 2% DAP three spray (20, 35, 50 DAT), T6- N100-P30-K40 + 2% DAP two spray (20, 35 DAT), T7- N100-P30-K40 + 2% DAP three spray (20, 35, 50 DAT), T8- N100-P45-K40 + 2% DAP two spray (20, 35 DAT), T9- N100-P45-K40 + 2% DAP three spray (20, 35, 50 DAT), T 10- N75-P30-K40 + 2% DAP two spray (20, 35 DAT), T11- N75-P30-K40 + 2% DAP three spray (20, 35, 50 DAT) and T12- N100-P15-K40 + Root treatment + 2% DAP three spray (20, 35, 50 DAT). Plant height, total number of effective tillers per hill and number of grains per panicle were recorded significantly in treatments T7- N100-P30-K40 + 2% DAP three spray (20, 35, 50 DAT), T8- N100-P45-K40 + 2% DAP two spray (20, 35 DAT) and T9- N100-P45-K40 + 2% DAP three spray (20, 35, 50 DAT) which was at par with treatment T3- N100-P60-K40, while test weight of grains showed a non-significant result due to different nutrient management practices. The highest grain and straw yields were recorded significantly in treatments T7- N100-P30-K40 + 2% DAP three spray (20, 35, 50 DAT), T6- N100-P30-K40 + 2% DAP two spray (20, 35 DAT) was at par with treatment T3- N100-P60-K40. The total N uptake were recorded significantly in treatments T7- N100-P30-K40 + 2% DAP three spray (20, 35, 50 DAT), T8- N100-P45-K40 + 2% DAP two spray (20, 35 DAT), T6- N100-P30-K40 + 2% DAP two spray (20, 35 DAT), T5- N100-P15-K40 + 2% DAP three spray (20, 35, 50 DAT) which was at par with treatment T3- N100-P60-K40. Total P uptake were recorded significantly in treatments T8- N100-P45-K40 + 2% DAP two spray (20, 35 DAT), T7- N100-P30-K40 + 2% DAP three spray (20, 35, 50 DAT), T6- N100-P30-K40 + 2% DAP two spray (20, 35 DAT) which was at par with treatment T3- N100-P60-K40. Total K uptake were recorded significantly in treatments T9- N100-P45-K40 + 2% DAP three spray (20, 35, 50 DAT), T7- N100-P30-K40 + 2% DAP three spray (20, 35, 50 DAT),T8- N100-P45-K40 + 2% DAP two spray (20, 35 DAT), T6- N100-P30-K40 + 2% DAP two spray (20, 35 DAT) which was at par with treatment T3- N100-P60-K40. Nutrient use efficiency of N, P and K is observed highest in treatment T11- N75-P30-K40 + 2% DAP three spray (20, 35, 50 DAT), T4- N100-P15-K40 + 2% DAP two spray (20, 35 DAT) and T3- N100-P60-K40 respectively.