Interactive effect of potassium and zinc on uptake of nutrients and quality of green gram (Vigna radiata L.)
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Date
2019
Authors
Satender Kumar
Journal Title
Journal ISSN
Volume Title
Publisher
CCSHAU
Abstract
An experiment was conducted under field conditions during kharif 2018 at CCS HAU, Regional Research Station, Bawal to study the “Interactive effect of potassium and zinc on uptake of nutrients and quality of green gram (Vigna radiata L.).” The experiment was laid out in a split plot design with three replications and treatments comprised four levels of potassium in main plots (0, 10, 20 and 30 kg K2O ha-1) and four levels of zinc in sub plots (0, 12.5, 25 and 37.5 kg ZnSO4) with basal application of RDF [06:16:00 kg ha-1 (N: P2O5:K2O)]. The results revealed that the number of nodules and their fresh weight was increased significantly with the application of potassium but non significantly with zinc application. Green gram seed and straw yield increased with the increase potassium and zinc application over control but significant up to the levels 20 kg K2O ha-1 and 25kg ZnSO4 ha-1. The quality parameters like as protein content and seed index significantly increased with the application of potassium up to 20 kg K2O ha-1, but non significantly with zinc levels. N, P, K and Fe content in seed and straw was significantly increased with the application of potassium. Zn content in seed and straw was increased significantly with the application of zinc. Uptake of macro and micro nutrients in seed and straw significantly increased with the application of potassium and zinc up to 20 kg K2O ha-1 and 25 kg ZnSO4 ha-1 respectively. Soil properties like pH, EC and organic carbon reported no significant changes with the levels of potassium and zinc. Available N, P, Mn and Cu of soil after crop harvest increased but non significantly and Fe increased significantly with the potassium application. The availability of particular nutrients significantly increased by its application, therefore availability of K significantly increased with potassium application and Zn with zinc application. Overall soil fertility was also found to be improved due to the application of potassium and zinc in green gram. Economic analysis was done to found the economic feasibility of the treatments and the higher net monetary returns Rs. 31528 ha-1 with B:C ratio (1.61) under the treatment combination K20Zn25 (20 kg K2O ha-1 along with 25 kg ZnSO4 ha-1) and this treatmentlooks more remunerative. It was concluded from the experiment that higher green gram yield was harvested with better quality and more net return when potassium and zinc was applied @ 20 kg K2O ha-1 and 25kg ZnSO4 ha-1 respectively.