Book of Extended summaries ISDA

International Conference on Reimagining Rainfed Agro-ecosystems: Challenges &
Opportunities during 22-24, December 2022 at ICAR-CRIDA, Hyderabad
was 995 and 194 mm respectively. Other standard agronomic package of practices were
followed both the crops.
Results
Results revealed that 50% basal N and P through DAP along with seed treatment by nano-DAP
@ 5 ml/kg seed and foliar spray of nano-DAP @ 2 ml/lit at 30 DAT exhibited maximum plant
height (101.03 cm), LAI (2.48), dry matter accumulation (1006.38 g/m 2 ), tiller number/hill
(17.67), root length/hill (27.23 cm), number of panicle/m 2 (170.92), number of grains/panicle
(113.48), grain yield (4250 kg/ha), straw yield (6378 kg/ha) of rice. This treatment enhanced
14.96% of grain yield over control (no basal DAP) and also showed higher net return (Rs.
40358/ha) and benefit-cost ratio (1.93) than others. In rapeseed, the tallest plant (95.95 cm),
highest values of leaf area index (3.51), dry matter accumulation (410.32 g/m 2 ) and primary
branches/plant (8.87) were obtained with N75 P75 K100 + nano DAP seed treatment @ 5 ml/ kg
seed & foliar spray @ 0.2% at 30 DAS and the lowest growth was observed in control plots
(N 0 P 0 K 100). No. of siliquas/plant (60.90), no. of seeds/siliqua (17.12), seed yield (767 kg/ha),
straw yield (1540 kg/ha), gross return (Rs. 46020/ha), net return (Rs. 22661/ha) and benefitcost
ratio (1.97) were also highest under this treatment, which increased seed yield by 21.38 %
over control.
Conclusion
The preliminary study showed the promising effect of nano-DAP as seed treatment @ 5 ml/kg
seed and foliar application @ 2 ml/lit at 30 DAT along with 100% recommended doses of NPK
in rice where 50% basal N and P applied through DAP, therefore, curtailed 50% DAP
requirement. Again, nano DAP @ 5 ml/ kg seed treatment and @ 0.2% foliar spray at 30 DAS
reduced 25% N and P requirement without affecting rapeseed yield. However, the study needs
few more years for recommendations to the farmers.
Effect of nano-DAP on growth parameters, yield of Kharif rice in 2021
Treatments
Plant height
(cm)
Panicles/m 2
Grain yield
(kg/ha)
Benefit-cost
ratio
T 1 : 0% P & 0% Basal N (No Basal DAP); 100% N
&K (Control)
95.73 155.56 3697 1.80
T 2 :100% NPK (100% Basal DAP) 99.20 166.12 3945 1.80
T 3 :25% Basal DAP (100% NPK) 97.01 160.87 3743 1.73
T 4 :50% Basal DAP (100% NPK) 97.26 161.58 3895 1.79
T 5 :T 1 + ST with Nano-DAP @ 2.5 ml/kg seed+ FS
with Nano-DAP @ 2 ml/lit at 30 DAT
T 6 :T 1 + ST with Nano-DAP @5 ml/kg seed+ FS with
Nano-DAP @ 2ml/lit at 30 DAT
98.18 164.77 3885 1.87
98.43 165.02 3895 1.87
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