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Articles by K.H. Shah
Total Records ( 4 ) for K.H. Shah
  M. Imtiaz , B.J. Alloway , K.H. Shah , S.H. Siddiqui , M.Y. Memon , M. Aslam and P. Khan
  The antagonistic effect of Zn and other micronutrients was studied in sand culture using Long Aston nutrient solution. Five levels of Zn were employed to wheat plant along with other essential plant nutrients. It was observed that Zn application had adverse effect on Fe concentration and Fe uptake in plant. Zinc deficient plants had significantly higher concentration of Fe. The results indicated that as the Zn concentration in the substrate was increased, the Fe concentrations in plants were decreased. Zinc also antagonised the uptake of Mn and Cu in the plants. Zinc had such a pronounced adverse effect on Cu concentration that its concentration dropped to deficiency level (3 μg ml-1). The roots always showed higher concentrations of these elements than shoots. The higher concentrations of trace elements were observed during first growth stage as compared with second growth stage.
  M. Imtiaz , B.J. Alloway , K.H. Shah , S.H. Siddiqui , M.Y. Memon , M. Aslam and P. Khan
  The effects of Zn on growth and growth components of wheat were studied in sand culture using hydroponics solution. Five Zn treatments were given to wheat along with other essential nutrients. The plants were stunted in the control pots and weaker than the plants treated with Zn due to Zn deficiency. The growth of plants, supplied 20 μg Zn ml-1 was also lower than the other Zn-treated plants. Well-defined Zn deficiency symptoms were not observed in wheat plants however copper deficiency symptoms were obvious when Zn was applied at the higher rate for a longer time. Dry matter of wheat increased by increasing rates of Zn up to 15 μg ml-1. Above these optimum rates, the higher rates of Zn application depressed the dry weight of crop. The plants from the control pots had lower Zn concentrations, which ranged between 15-16 μg g-1. The data also revealed that Zn concentration in the second growth stage (S2) was lower compared to the first growth stage (S1) and the uptake of Zn by the plants was higher as dry matter yield was higher for stage S2.
  K.H. Shah , S.H. Siddiqui , M.Y. Memon , M. Aslam , M. Imtiaz and P. Khan
  Low native soil P availability coupled with poor recovery of added P has become one of the major constraints limiting the productivity of crops. A field study was, therefore, conducted to compare the relative significance of fertigation and different modes of broadcast method for utilization of P when applied at the rate of 100 kg ha-1 in wheat crop. Compared to broadcast method, P applied through fertigation in single split was effectively utilized in terms of producing significantly higher crop harvests, P uptake, P recovery and agronomic efficiency. Owing to superiority of fertigation over broadcast method, it is being introduced to farming community for economizing fertilizer P and obtaining better crop harvests.
  K.H. Shah , M.Y. Memon , S.H. Siddiqui , M. Imtiaz and M. Aslam
  Field investigations were carried out to evaluate the performance of two wheat genotypes when sprayed at different growth stages using 2, 4 and 6% urea solution. Compared to standard soil application, foliarly applied urea was betterly utilized by Soghat-90 and Sind-81. Irrespective of growth stages, foliage efficacy of urea was most prominent at 4% solution. Significantly higher crop harvests, N uptake and agronomic efficiency were recorded when both wheat cultivars were sprayed at tillering and heading stages. Grain protein content was improved by late season spraying with 6% urea solution.
 
 
 
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