Studies on compatibility of zinc application with sources and levels of phosphorus in sugarcane
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Date
2005-08
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G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand)
Abstract
A field experiment entitled “Studies on compatibility of zinc application with sources and levels of phosphorus in sugar cane” was conducted at the Crop Research Center of Govind Ballabh Pant University of Agriculture and Technology, Pantnagar during 2004-05. The experiment consisted of two sources of phosphorus (SSP and DAP), three levels of phosphorus (40, 60 and 80 Kg P2O5 ha-1) and three levels of zinc sulphate (20, 30 and 40 Kg ZnSO4 ha-1). The treatments were tested in split plot design with three replications; keeping combinations of sources and levels of phosphorus in main plots and levels of zinc sulphate in sub plot. The variations in different growth, quality and yield parameters were not significantly affected with different sources of phosphorus. However, crop fertilized with 80 Kg P2O5 ha-1 recorded significantly higher germination percentage; shoot population and growth parameters like shoot height, number of physiologically active leaves, cane diameter and dry matter accumulation. All the yield attributing characters viz. number of millable canes, average cane weight, cane diameter, cane length and number of internodes per cane and cane, trash and green tops yield were significantly higher in this treatment. Quality parameters like juice brix, purity, available sugar and commercial cane sugar yield were also of significantly higher values with the application of 80 Kg P2O5 ha-1. Application of 40 Kg ZnSO4 ha-1 significantly improved shoot population and growth parameters except cane germination. Crop fertilized with 40 Kg ZnSO4 ha-1 exhibited significantly higher yield attributing characters and cane, trash and green top yield over lower levels of zinc sulphate. Juice quality and commercial cane sugar yield also improved due to zinc application.
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