Management of high bicarbonate irrigation waters for growing crops
2001
Yasin, M. | Niazi, B.H. | Rafique, E. (National Agricultural Research Centre, Islamabad (Pakistan). Land Resources Research Inst.)
A greenhouse experiment was conducted to study the effect of six synthetic waters having two TDS levels (10 and 20 me L-1) and three RSC levels (0.0, 2.5 and 5.0 me L-1) on maize crop using gypsum a 0, 50 and 100% of GR. Gypsum was also compared with sulphur, pressmud and farmyard manure in a sandy loam soil using cropping sequence of wheat- maize-wheat. Dry matter yield of maize and grain yield of both wheat crops decreased significantly by increasing TDS and RSC of synthetic waters. With the exception of soil pH, ECe and precipitation of CaCO3 in soil increased by using synthetic saline sodic waters. The response of gypsum on first maize crop was little. Amendments like gypsum, sulphur, pressmud and farmyard manure exhibited positive effect on maize and wheat yield. FYM @ 20 t acre-1 and water application of G-50% and G-100% both in maize and wheat and S-100% only in wheat produced significantly higher grain and straw yield. The sodic waters thus can be used safely by using gypsum and other amendments.
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