Variations in Zinc availability and its fractions after Kharif Maize in Calcareous Soil
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Date
2020
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DRPCAU, Pusa
Abstract
An experiment was conducted during kharif season of 2019-20 with maize crop at the experimental farm area allotted for Soil Science trials, Dr. Rajendra Prasad Central Agricultural University, Pusa (Samastipur), Bihar. The trial was designed in Randomized Block Design with having the thirteen treatments. Each treatment was replicated thrice with four zinc doses i.e. 2.5, 5.0, 7.5 and 10.0 kg ha-1, respectively which was supplemented by zinc sulphate (ZnSO4) during Kharif season . In first set of four treatments, Zn was applied only for the first year while in the second and third set of experiment, it was given at alternate years and every year, respectively along with a control. Collection of soil samples were done at pre sowing stage and after harvest of maize crop.
Inferences of the findings clearly indicated that with the increasing doses and frequencies of zinc application, the increase in DTPA extractable zinc in all the three depths were observed. Most of the applied zinc was contributed in upper layer (0-15 cm) of soil than lower layers of soil (15-30 cm). Initial year of using Zinc at varying rates had similar concentrations of Zinc fractions. In every year, Zn application mode, the increasing rates of Zn have significantly higher Zn fraction concentration 5 kg Zn application at alternate years had significantly lower available Zn concentration as compared to Zn application @2.5 kg ha-1 at each year. Most of Zn fractions were accumulated in surface (0-15cm) soil and its concentration declined with increasing depths in all the modes of Zn application. Among all Zn fractions present in soil exist in dynamic equilibrium with each other and grain yield was strongly correlated with all these fractions. Sbo-Zn fraction emerged as most dominant
fractions which contributed significantly to maize grain yield and accounted for 94.7% variation in maize yield.An experiment was conducted during kharif season of 2019-20 with maize crop at the experimental farm area allotted for Soil Science trials, Dr. Rajendra Prasad Central Agricultural University, Pusa (Samastipur), Bihar. The trial was designed in Randomized Block Design with having the thirteen treatments. Each treatment was replicated thrice with four zinc doses i.e. 2.5, 5.0, 7.5 and 10.0 kg ha-1, respectively which was supplemented by zinc sulphate (ZnSO4) during Kharif season . In first set of four treatments, Zn was applied only for the first year while in the second and third set of experiment, it was given at alternate years and every year, respectively along with a control. Collection of soil samples were done at pre sowing stage and after harvest of maize crop.
Inferences of the findings clearly indicated that with the increasing doses and frequencies of zinc application, the increase in DTPA extractable zinc in all the three depths were observed. Most of the applied zinc was contributed in upper layer (0-15 cm) of soil than lower layers of soil (15-30 cm). Initial year of using Zinc at varying rates had similar concentrations of Zinc fractions. In every year, Zn application mode, the increasing rates of Zn have significantly higher Zn fraction concentration 5 kg Zn application at alternate years had significantly lower available Zn concentration as compared to Zn application @2.5 kg ha-1 at each year. Most of Zn fractions were accumulated in surface (0-15cm) soil and its concentration declined with increasing depths in all the modes of Zn application. Among all Zn fractions present in soil exist in dynamic equilibrium with each other and grain yield was strongly correlated with all these fractions. Sbo-Zn fraction emerged as most dominant
fractions which contributed significantly to maize grain yield and accounted for 94.7% variation in maize yield.