Browsing by Author "SUJATHA, KUNA"
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ThesisItem Open Access RELATIVE EFFICIENCY OF CHELATED AND UNCHELATED ZINC ON GROUNDNUT(ACHARYA N.G. RANGA AGRICULTURAL UNIVERSITY, RAJENDRANAGAR, HYDERABAD, 2004) SUJATHA, KUNA; SESHAIAH, B.VA field experiment was conducted at the Agricultural College Farm, Bapatla during rabi, 2003-2004 to study the relative efficiency of chelated and unchelaed zinc on groundnut cv TMV-2 under irrigated conditions in sandy soil with medium available P and K low N and S status and deficient in zinc. The experiment was laid out in RBD with eleven treatments, replicated thrice. The treatmental details are as follows : T1 : Control (without Zinc application) T2 : Zinc sulphate 12.5 kg ha-1 as basal application T3 : Zinc sulphate 25 kg ha-1 as basal application T4 : Zinc sulphate 50 kg ha-1 as basal application T5 : Zn-EDTA 1.25 kg ha-1 as basal application T6 : Zn-EDTA 2.5 kg ha-1 as basal application T7 : Zn-EDTA 5.0 kg ha-1 as basal application T8 : Zinc sulphate foliar spray 0.2% concentration at 25 and 35 DAS T9 : Zinc sulphate foliar spray 0.4% concentration at 25 and 35 DAS T10 : Zn-EDTA foliar spray 0.05% concentration at 25 and 35 DAS T11 : Zn-EDTA foliar spray 0.1% concentration at 25 and 35 DAS A common dose of 40 kg N ha-1 through urea, 60 kg P2O5 ha-1 as SSP and 40 kg K2O ha-1 in the form of MOP were applied to all the plots. Entire quantity of N, P and K was applied basally. Gypsum was applied @ 500 kg ha-1 at flowering stage. Zinc was applied as per the treatments. Leaf samples (leaves emerged after foliar application of zinc) were collected at 50 DAS. At harvest, samples of pods and haulms were collected after recording their dry weights. The plant samples collected at 50 DAS and at harvest were analysed for N, P, K and Zn. After harvest of the crop, soil samples were collected from each plot and analysed for available N, P, K and Zn. Application of zinc significantly increased the zinc content of leaves at 50 DAS and the haulm and pod yields of groundnut irrespective of the source, either zinc sulphate or Zn-EDTA and their method of application (soil or foliar application). Application of zinc sulphate significantly increased the pod and haulm yields upto 25 kg ZnSO4 ha-1. Application of chelated zinc (Zn-EDTA) significantly increased the pod and haulm yields of groundnut upto 5 kg Zn- EDTA ha-1, the highest level tried. Application of zinc in both the forms (i.e., chelated and unchelaed) increased the uptake of nutrients by the crop. At the rates applied, ZnSO4 (unchelated zinc) was found to be superior to Zn-EDTA (chelated zinc) in influencing the yield and uptake of the nutrients. Among the methods of application, soil application was found to be superior to foliar application in this regard. Available zinc content of soil increased due to soil application of increasing levels of zinc, applied either as zinc sulphate or Zn-EDTA.