|Author:||Rao, C. S. ; Prasad, J. V. N. S. ; Vittal, K. P. R. ; Venkateswarlu, B. ; Sharma, K. L.|
|Book Group Author:||NA|
Rainfed areas in India experience frequent drought spells resulting in severe moisture stress in the soil-plant system. Besides the amount and distribution of rainfall, soil type and its depth are other important factors that affects the moisture availability for crop growth. Soils (Vertisols, Alfisols, Inceptisols, Entisols and Aridisols) in rainfed areas are generally deficient in one or more nutrients. Optimum nutrition helps in the early establishment of rainfed crops by developing the right crop canopy structure and root system. A balanced nutrition increases the amount of vegetative cover, which has a key role in retarding runoff and increase infiltration. Optimum nitrogen and phosphorus nutrition results in the development of deep root systems, increased leaf area and chlorophyll content. Adequate potassium supply, on the other hand, helps in plant water conservation by regulating stomatal resistance. Sulfur addition is essential to oilseed and pulse crops on sulfur-deficient soils. Zinc deficiency is more common in most of the soils in the rainfed regions of India. In view of these multinutrient deficiencies, the addition of optimum nutrients act as drought insurance for dryland crops. The supply of nutrients in the form of organic manures helps in retaining more moisture, which otherwise will go to waste as runoff water, increasing the water storage capacity and thereby increases water and nutrient use efficiency in drylands. Combining in-situ soil moisture conservation and balanced nutrient supply could boost the productivity levels in dryland agriculture. Tabulated data are presented on several integrated nutrient management options for various crops in the rainfed regions of India.
|Pages:||105 - 114|
Alfisols, arid lands, arid zones, Aridisols, canopy,chlorophyll, crop yield, drought, drought resistance, Entisols, grainlegumes, ground cover, Inceptisols, infiltration, leaf area, manures,nitrogen, nutrient availability, nutrient deficiencies, oilseed plants,phosphorus, plant nutrition, plant water relations, potassium, rain,root systems, roots, runoff, soil depth, soil fertility, soil types,soil water content, stomata, stomatal resistance, stress, stressresponse, sulfur, use efficiency, Vertisols, water conservation, waterstress, water use efficiency, zinc, India, South Asia, Asia, DevelopingCountries, Commonwealth of Nations, arid regions, crown cover, droughttolerance, elemental sulphur, leaf canopy, oilseed crops, pulses,rainfall, sulphur, Field Crops (FF005) (New March 2000), Plant Nutrition(FF061), Plant Water Relations (FF062), Environmental Tolerance ofPlants (FF900), Soil Chemistry and Mineralogy (JJ200), Soil Physics(JJ300), Soil Fertility (JJ600), Erosion; S