Please use this identifier to cite or link to this item: http://krishikosh.egranth.ac.in/handle/1/73174
Authors: Dileep Kumar
Advisor: Shiva Dhar
Title: Agronomic biofortification through zinc nutrition in maize (Zea mays) ─ wheat (Triticum aestivam) cropping system By Dileep Kumar A Thesis Submitted to
Other Titles: Ph.D.
Publisher: IARI, DIVISION OF AGRONOMY, NEW DELHI
Type: Thesis
Agrotags: Zinc, protein, water absorption capacity, sedimentation value, micronutrient concentration
Abstract: An experiment was conducted during 2009-10 and 2010-11 at research farm of division of Agronomy, IARI, New Delhi, to study the effect of various doses and methods of zinc application on quality parameter of maize and wheat. The treatment consisted of control (no ZnSO4), soil applied 12.5 kg ZnSO4 ha-1 and 25 kg ZnSO4 ha-1; and foliar spray of 0.5 % ZnSO4 at knee height stage and second spray one week later in case of maize whereas at the time of anthesis and one week after previous one in case of wheat and two wheat varieties ‘DBW 17’ and ‘PBW 343’. These treatments were tested in randomised block design in maize and in wheat treatment were splitted to accommodate two varieties keeping maize as main plot with three replications. Application of various levels of zinc sulphate on maize and wheat did not show any significant effect on protein concentration in grain and other grain quality parameters. Concentration of nitrogen and potassium in grain did not differ significantly due to application of zinc sulphate during both the year. However, phosphorus concentration affected significantly during both the year. Relatively higher protein content was obtained from soil application of 25 kg ZnSO4 ha-1 followed by 12.5 kg ZnSO4 ha-1, foliar spray of 0.5 % ZnSO4 and control during both the year. Concentration of iron and manganese in grain did not vary significantly due to zinc application during both the year. However, during second year significant difference were observed in zinc and copper concentration due to application of zinc. During first year relatively higher zinc concentration was obtained due to soil application of 25 kg ZnSO4 ha-1 than foliar spray of 0.5 % ZnSO4 and 12.5 kg ZnSO4 ha-1. During second year the highest concentration of Zn recorded with the application of 25 kg ZnSO4 ha-1 which was significantly higher than the foliar spray of 0.5 % ZnSO4 and control but at par with the 12.5 kg ZnSO4 ha-1. Relatively higher iron concentration was recorded with the soil application of 25 kg ZnSO4 ha-1 than12.5 kg ZnSO4 ha-1, foliar spray of 0.5 % ZnSO4 and control during both the year. Nitrogen concentration during first year and phosphorus concentration during second year in which grain showed significant variation due to different levels of zinc sulphate. Marginally higher phosphorus concentration was recorded from 25 kg ZnSO4 ha-1 and 12.5 kg ZnSO4 ha-1 than foliar spray 0.5 % ZnSO4 and control during first year in wheat. Zinc applied directly to wheat varieties ‘DBW 17’ and ‘PBW343’ showed that protein content, flour recovery and 58 water absorption capacity did not vary significantly during both the year. During second year significant differences were observed in hardness and during first year sedimentation values varied significantly. Application of 25 kg ZnSO4 ha-1 to ‘DBW 17’ recorded relatively higher protein content than 12.5 kg ZnSO4 ha-1, foliar spray of 0.5 % ZnSO4 and control during first year. During second year application of 25 kg ZnSO4 ha-1 and foliar spray gave comparatively higher protein content than control and 12.5 kg ZnSO4 ha-1. Sedimentation value recorded in ‘DBW 17’ due to direct zinc application of 25 kg ZnSO4 ha-1 in wheat was found significantly higher than control, 12.5 kg ZnSO4 ha-1 and foliar spray of 0.5 % ZnSO4. In ‘PBW 343’ significantly higher sedimentation value was observed with the application of 25 kg ZnSO4 ha-1 than control, 12.5 kg ZnSO4 ha-1, and foliar spray of 0.5% ZnSO4 concentration of iron, zinc, copper and manganese during first year differ significantly due to application of zinc sulphate to preceding maize crop but no significant changes were observed during second year. The application of 25 kg ZnSO4 ha-1 significantly increased zinc concentration during both the year in ‘PBW 343’ while in ‘DBW 17’ during first year. Higher zinc concentration recorded in ‘DBW 17’ with the application of 25 kg ZnSO4 ha-1 than control but it was at par with 12.5 kg ZnSO4 ha-1 and foliar spray of 0.5% ZnSO4 during second year. Zinc concentration obtained with the application of 12.5 kg ZnSO4 ha-1 found almost similar to foliar spray of 0.5% ZnSO4 during both the year; however it was similar to control during first year and significantly higher than control during second year. Application of zinc to preceding maize crop significantly influenced concentration of iron, copper and manganese concentration, while zinc concentration remained unaffected during both the year. Zinc applied directly to wheat varieties showed significant effect on micronutrient concentration during both the year.
Description: T-8785
Issue Date: 2013
Appears in Collections:Theses

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