By Prakash Kumar
Nutrient imbalance in soils is an rising hazard to sustainable agriculture: extensive cultivation, use of terrible caliber groundwater, depletion of soil natural topic and over the top use of fertilizers are significant purposes for bad soil fertility around the globe. Richly illustrated with six hundred colour images, this booklet is a visible box id advisor for indicators of commonest nutrient deficiencies in box plants, masking all their phases of prevalence. certain descriptions and advised for administration practices are given with each one access.
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Extra info for Nutrient Deficiencies of Field Crops: Guide to Diagnosis and Management
3. 4. 5. 6. 7. 8. 9. Soils having low organic matter. Cases of insufﬁcient application of nitrogenous fertilizers. Soils exhausted by intensive cropping. Soils with nitrogen losses due to heavy rainfall. Permanently submerged conditions. Temporary drying out of the soil during the growing period. Poor biological nitrogen ﬁxation. 0. 0. Integrated nutrient management Plate 66. Nitrogen-deﬁcient leaf with a normal leaf. ) 1. Get the soil analysed before sowing to measure the amount of ‘available’ nitrogen in the soil.
ZINC (Zn) DEFICIENCY Symptoms Plate 56. Deﬁcient plant with bands or streaks. ) 1. Maize is one of the best indicator plants of zinc deﬁciency. The crop suffers badly if zinc is deﬁcient. 2. Zinc deﬁciency may cause delayed and irregular silk emergence with distorted tassels devoid of anthers. 3. Deﬁciency prevents elongation of internodes, resulting in leaves being crowded together at the top of the plant and making a fan-shaped appearance. 4. Zinc deﬁciency symptoms in maize occur within 2 weeks after seedling emergence.
However older leaves remain normal, without any tip necrosis. Developmental stages Stage I: In mild deﬁciency and during younger stages of the crop, all leaves on the whole plant become pale green. Stage II: If the deﬁciency persists and becomes more severe, the younger leaves turn pale yellow (Plate 75). Stage III: In acute deﬁciency conditions, tip necrosis appears on younger leaves; older leaves remain normal without any tip necrosis. Likely to occur in Plate 77. Deﬁcient plant showing the pale yellow youngest leaf.