2024, Vol. 7, Issue 1, Part B

author(s)
Shalini Mishra, K Tedia, LK Srivastava and GK Jatav

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), T_5- 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.