Book of Extended summaries ISDA

International Conference on Reimagining Rainfed Agro-ecosystems: Challenges & Opportunities
during 22-24, December 2022 at ICAR-CRIDA, Hyderabad
Methodology
The field experiment on rRabi sorghum (cultivar M 35-1) under dryland conditions was laid out
conducted at AICRP for Dryland Agriculture Research Station, Mulegaon Farm, Solapur during
2005-06 to 2016-17 for twelve years. The experiment was laid out in split plot design containing
nine treatment combinations replicated three times includes three main plot treatments viz: 1)
Low tillage (LT) - sowing with seed drill and light harrowing after sowing – (SSLH) 2)
Medium tillage (MT) - one harrowing + SSLH+ one hoeing 3) Conventional tillage (CT) -
plough once in 3 year + one harrowing + ridges and furrows + one harrowing + SSDH + three
hoeings and three sub-treatments viz: 1) Organics - 50 kg Nha -1 (50 % CR+50 % LL) CR–Crop
residue, LL–Leucaena loppings - N1 2) Organics + chemical fertilizers - 25 kg N ha -1 through
urea + 25 kg N ha -1 through organics (50 % CR + 50 % LL) - N2 3) Fertilizers (RDF) : 50 kg
N + 25 Kg P2O5 ha -1 - N3.
The average nitrogen content of crop residue and leucaena during 12 years are 0.48 % and 3.04
% respectively. The N, P and K were applied through urea, single super phosphate and muriate
of potash respectively. The data on crop yield, total N uptake, economics, moisture use
efficiency (MUE) of grain were recorded at harvest of sorghum. After harvest of crop, soil
samples were collected (0-15 cm) and analyzed for organic carbon (wet oxidation method),
available N (0.32 % alkaline KMnO4oxidizable), available P (0.5 M NaHCO3 extractable, pH
8.5,) and K (Neutral normal ammonium acetate extractable) following the procedures described
by Page et al. (1982).
The input energy (MJ ha −1 ) and output energy was/ were computed for each treatment and
expressed in terms of MJ ha −1 as suggested by Mittal et al. (1985). The energy use efficiency
(EUE) derived as a ratio of output and input energy for each treatment (Sankar et al., 2013).
Results
In the tillage and nutrient management practices, the maximum input energy was observed in
CTN1 (63924 MJ ha -1 ) whereas the minimum input energy was observed in treatment LTN3
(4391MJ ha -1 ) followed by treatment MTN3 (4945 MJ ha -1 ). The maximum output energy was
observed in MTN2 (70389 MJ ha -1 ) followed by CTN2 (68308 MJ ha -1 ). The maximum energy
use efficiency was observed in LTN3 (13.865) followed by MTN3 (13.323).
In case of nutrient management, the maximum energy use efficiency was observed in N 3 (11.919)
followed by N 2 (1.966). Also, it is observed that, minimum energy of 48.22 MJ was required for
production of one kg grain where nutrition of 50% organic and 50% inorganic N recorded highest
625 | Page Resource conservation and rainfed agriculture