Abstract
The pot experiment was carried out during September 2015 to January 2016 at instructional farm, College of Agricultural Engineering, UAS Raichur under rain shelter to study the effect of different water regimes, (i.e. T1:100, T2:90, T3:80, T4:70, T5:60 and T6:50) per cent of water application with available moisture holding capacity on grain yield and water use efficiency. Completely Randomized block design with four replications was used in this study. The results showed that there was significant difference between the yield and (WUE) under different levels of irrigation. The total irrigation water applied were (i.e., 211.98, 243.02, 225.78, 155.09, 135.51 and 105.62 mm/plant) under different water regime treatments (100, 90, 80, 70, 60 and 50 %) of available moisture holding capacity (AMHC) respectively. Grain yield productions under different treatments were 106.25, 171.25, 127.50, 75, 55 and 40.75 g/plant/pot at 100, 90, 80, 70, 60 and 50 per cent of AMHC respectively. The results showed that water use efficiency (WUE) at different treatments were 0.50, 0.70, 0.56, 0.48, 0.41 and 0.39 g/mm for (100, 90, 80, 70, 60 and 50 %) per cent of AMHC respectively. Therefore, the 90 % of AMHC treatment (T2) is recommended for groundnut irrigation for water saving. The comparison of actual crop coefficient that obtained by water balance technic in experiment and crop coefficient (Kc) values of groundnut for different crop growth stages were selected based on the values suggested by FAO (Allen et al., 1998) are similar in the treatment of 90 % (T2) of the AMHC. Furthermore, the result showed that the treatment of 90 per cent of Available moisture holding capacity (T2) seemed to be better adapted to product a high crop yield with acceptable yield coupling with water use efficiency in this region.
Highlights
Water resources were considered bountiful so far, but have come under increasing pressure, primarily due to burgeoning population and competing demand from other water consuming sectors
To a large extent when water given is below 80% of available moisture holding capacity (AMHC), it negatively affects growth, development and total yield or profitability of groundnut production in the north eastern dry zone (Raichur) of Karnataka
The crop coefficient Kc values for the north eastern dry zone (Raichur) of Karnataka are between 0.44-0.98
Summary
Water resources were considered bountiful so far, but have come under increasing pressure, primarily due to burgeoning population and competing demand from other water consuming sectors. On a dry seed basis [2]. Even though it is a fairly droughttolerant, production fluctuates considerably as a result of rainfall variability. This is because farmers are afraid of low yields due to scarcity of water during the lean season. There is no information to help farmers to manage this scarce resource called water during drought in order to optimise yields in the lean season
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