Growth, water and NPK utilization efficiency of wheat (Triticum aestivum L.) as affected by tillage, moisture regime and nitrogen fertilization after wetland rice in warm region
1992
Ahmed, Md.M.
Results showed that increasing the IW/CPE ratios from 0.4 to 0.7 and 1.0 increased the amount and frequency of irrigation and positively influenced crop growth and yield. The increase in yield at higher moisture regimes was due to production of higher number of spikes per square meter, grains per spike and heavier grains. The irrigation water use efficiency and the consumptive water use efficiency were inversely related with the IW/CPE ratios and the IW/CPE ratio of 0.4 produced about two-fold higher grain yield per mm of irrigation as compared to IW/CPE ratio of 1.0 though the overall grain yield was much lower. Increasing tillage intensity, on the other hand, had lower consumptive water use but produced higher grain yield. No-tillage had the lowest water use efficiency while it consumed the highest amount of water. The phosphorus and potassium content of the grain was neither affected by the moisture regimes nor the tillage practices but the nitrogen content was higher at lower IW/CPE ratios. The total uptake of nitrogen, phosphorus and potassium increased as the amount and frequency of irrigation increased due to higher grain and straw yields. The amount of uptake was reduced in no-tillage. N application stimulated crop growth and produced more tillers per plant and higher leaf area indices and increased dry matter yield. Omitting N application at planting delayed crown root initiation and affected crop growth adversely
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