Nutrient requirement is basically a genetic characteristic of the crop plants and this requirement may vary with the genotypes of particular crop. Nutrient removal by any crop depends on the nutrient availability in soils and their absorption, which is influenced by soil pH, moisture and temperature. In general vegetable crops exert tremendous pressure on the soil for nutrients due to their high productive ability. Nutrient removal is perhaps the most critical when sustainability of a farming system is considered. If the nutrient removal from the fields is not replaced, the farming system will not remain sustainable due to decline in the soil productivity. Balanced use of plant nutrients corrects nutrient deficiency, improves soil fertility, increases nutrient and water use efficiency, enhances crop yields and farmers’ income, betters crop and environmental quality.
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