Author(s):

Priyanka, SK Sharma and RH Meena

Abstract: A field study entitled “Fractionation and distribution of zinc under integrated nutrient management system on LTFE’s maize-wheat cropping system in Typic Haplustept soils of Udaipur” was conducted during Kharif 2014-15 and 2015-16 in the Long Term Fertilizer Experiments initiated in Kharif, 1997 at the Instructional Farm of the Rajasthan College of Agriculture, Udaipur. The soil of the experimental site was sandy clay loam in texture, slightly alkaline in reaction, medium in available nitrogen and phosphorus, while high in potassium and zinc. The objectives were to assess effect of INM on cationic Zinc fractions and to establish relationship among Zn fractions themselves and with yield, nutrient uptake by maize and wheat and soil properties. The soil of the experimental field was sandy clay loam in texture, non-saline and slightly alkaline in reaction. The experiment consisted of 12 treatment combinations with four replications in a randomized block design. After harvest of Wheat crop under maize-wheat rotation of both years (2014-15 & 2015-16), the pooled analysis reveals that integrated nutrient management practice (100% NPK+ FYM 10 t ha^-1) increased zinc fractions except DTPA soluble. However, DTPA–Zn was significantly high with 100% NPK +Zn application followed by 100% NPK +Zn +S. These zinc fractions deceased with depth in all INM treatments. Water soluble zinc fraction highly correlated with reducible (0.926**) and DTPA (0.914**) fractions. DTPA –Zn and reducible Zn also correlated (r = 0.920**) significantly. Positive correlation between Zn fractions and OC and negatively with pH was observed under this study. Exchangeable-Zn was highly correlated with yield and DTPA-Zn with grain yield and Zn uptake by grain. The values of different Zn fractions were correlated and found that total Zn had positive and significant correlation with other fractions, suggesting the existence of dynamic equilibrium among the different forms. It is quite evident from the values of coefficients of correlation that almost all fractions are dependent upon each other.

Pages: 2301-2305  |  1909 Views  541 Downloads

Download (275KB)