Effect of nature and fertilizer zinc on dry matter yield and zinc uptake by wheat (Triticum aestivum L.) in Udic Ustochrepts
1992
Dwivedi, B.S. | Tiwari, K.N. (Chandra Shekhar Azad University of Agriculture and Technology, Uttar Pradesh (India). Department of Soils and Agricultural Chemistry)
Twenty experiments were conducted on cultivators' fields to study the Zn nutrition of wheat as influenced by nature and fertilizer Zn in an extensive soil series of Kanpur, Uttar Pradesh, India. Wheat cultivar 'Sonalika' was used and the Zn rates applied were 0, 1.25, 2.50 and 5.00 kg Zn/ha. Application of 5.00 kg Zn/ha resulted in a significant increase in the wheat dry matter yield, Zn concentration and uptake of Zn by the crop in soils testing DTPA-Zn below 0.6 ppm; response showed a decrease with an increase DTPA-Zn status of the soil. The requirements of fertilizer Zn for optimum grain yield were 6.32 and 2.52 kg/ha in soils of low 0.60 ppm and medium 0.60-1 ppm DTPA-Zn status, respectively. Recovery of fertilizer Zn was higher in low Zn soils and vice versa. The DTPA-Zn status of soil and Zn concentration in the leaf were related with percentage grain yield. The critical limit of DTPA-Zn and Zn content of the third leaf of 45 days old plants for predicting the response of wheat to applied Zn was computed to be 0.06 and 18.4 ppm respectively.
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