Deficit Irrigation Practices (Water Reports,) by Food and Agriculture Organization of the United Nations

By Food and Agriculture Organization of the United Nations

The good problem for the longer term could be the job of accelerating nutrition construction with much less water, really in nations with restricted water and land assets. within the context of bettering water productiveness, there's a growing to be curiosity in "deficit irrigation" - an irrigation perform wherein water provide is diminished less than greatest degrees and delicate rigidity is authorized with minimum results on yield. This book provides a variety of stories, conducted for a number of vegetation and below various ecological stipulations, exhibiting a few of the strategies and practices of deficit irrigation and the affects of diminished irrigation water offer on crop yield. The synthesis exhibits that deficit irrigation can lead to tremendous water discount rates with little effect at the caliber and volume of the harvested yield.

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The requirements increase in the later stages of crop growth, especially during pegging and pod development, when evaporative demands also are high (April and May) (Figure 1). The soil needs to be moist for peg penetration and pod development. 2°C higher in treatment T 102 (Table 2). Soil water contents at both depths were always less in the irrigation-withheld plots than in the control plots. In control plots the water content generally remained around 18-20 percent at a depth of 0-15 cm, and 19-23 percent at 15-30 cm.

Guidelines for predicting crop water requirements by J. O. Pruitt. FAO Irrigation and Drainage Paper No. 24. Rome. , Hera, C. R. ). 1999. Crop yield response to deficit irrigation. Dordrecht, The Netherlands, Kluwer Academic Publishers. , Mohammad, W. & Nawaz, H. 1999. Field response of potato subjected to water stress at different growth stages. In: C. Kirda, P. Moutonnet, C. R Nielsen, eds. Crop yield response to deficit irrigation. p. 213-223. Dordrecht, The Netherlands, Kluwer Academic Publishers.

Soil moisture deficit stress during vegetative growth increased total biomass accumulation and pod yield. These increases were due mainly to increases in leaf area during reproduction, and partitioning of more dry matter to the reproductive parts. In addition, the yield advantage due to water stress in the vegetative phase was due to improved synchrony in flowering and the increased peg-to-pod conversion. Moreover, stress during vegetative growth may have promoted root growth, an area which requires further study.

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