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Agronomic biofortification through zinc nutrition in maize (Zea mays) ─ wheat (Triticum aestivam) cropping system By Dileep Kumar A Thesis Submitted to

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Title Agronomic biofortification through zinc nutrition in maize (Zea mays) ─ wheat (Triticum aestivam) cropping system By Dileep Kumar A Thesis Submitted to
Ph.D.
 
Creator Dileep Kumar
 
Contributor Shiva Dhar
 
Subject Zinc, protein, water absorption capacity, sedimentation value, micronutrient concentration
 
Description T-8785
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
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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.
 
Date 2016-08-20T13:59:46Z
2016-08-20T13:59:46Z
2013
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/73174
 
Format application/pdf
 
Publisher IARI, DIVISION OF AGRONOMY, NEW DELHI