Book of Extended summaries ISDA

International Conference on Reimagining Rainfed Agro-ecosystems: Challenges & Opportunities
during 22-24, December 2022 at ICAR-CRIDA, Hyderabad
available nitrogen (178 kg/ha), and medium available phosphorus (18 kg/ha) and potassium
(108 kg/ha). The experiment consisted of ten treatments of inorganic and organic
combinations of nutrient sources, viz T 1: Control; T 2: 100 % recommended fertilizer dose-
RFD (60:40:20 NPK kg/ha); T3: 50 % RFD NPK; T4: 50 % N (crop residue); T5: 50 % N
(FYM); T 6: 50 % RFD + 50 % N (crop residues); T 7: 50 % RFD + 50 % N (FYM); T 8: FYM
10 t/ha; T9: 100 % RFD + ZnSO4 20 kg/ha and T10: Farmers practice (FYM 4 t/ha + urea 40
kg/ha). Maize (var Mansar) was shown in the month of June- July and harvested in
September-October during kharif seasons of 2019 to 2020, respectively. The crops were sown
in lines with a spacing of 60 cm x 20 cm, respectively.
Results
Among the different organic and inorganic treatments, the maximum plant height (215 cm)
was recorded with application of 50 % recommended NPK + 50% N (FYM) which was
found to be statistically at par with the treatment where application of 50 % recommended
NPK + 50% N (Crop residues) was applied during the experimentation. The improved growth
in plant might be due to increased cell division and photosynthetc efficency because of
enhanced availabilty of nutrients. (Tomar et al., 2017). With regard to yield and yield
attributes, the treatment where application of 50 % recommended NPK + 50% N (FYM) was
applied recorded significantly highest grain (22.33 q ha -1 ) and stover (46.26 q ha -1 ) yield of
maize which was statistically at par with the treatment 50 % recommended NPK + 50% N
(Crop residue) while the lowest yield was recorded in control plots. Likewise, the highest net
returns to the tune of ₹ 24716 ha -1 was realized with the application of application of 50 %
recommended NPK + 50% N (FYM) with B:C ratio of 2.01. Similar results were observed by
Gupta,et.al( 2014). The increase in yield with addition of FYM alone or in combination of
inorganic fertilizers may be attributed to the fact that FYM being the store house of nutrients
also made release of applied nutrients at its optimum at the same time improved the soil
physical conditions (Kumar et al. 2002).
Treatment
Effect of organic and inorganic nutrients on growth yield and economics of
maize under rainfed conditions (pooled data of two years)
Plant
height
(cm)
Grain
yield
(q ha -1 )
Straw
yield
(q ha -1 )
Net
returns
(₹ ha -1 )
Control 171 7.55 18.00 853 0.95
100 % recommended NPK 195 17.29 36.68 16881 1.79
50 % recommended NPK 184 12.09 26.56 7138 1.36
50 % recommended N (Crop residue) 187 13.25 28.62 7859 1.37
50 % recommended N (FYM) 187 14.04 29.97 8658 1.39
50 % recommended NPK + 50% N (Crop 205 20.63 42.51 21496 1.90
B.C
Resource conservation and rainfed agriculture
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