Mexi-Pak, a modern high yielding semi-dwarf whert variety with high response to fertilization showed higher photosynthetic rate and higher transpiration rate per unit leaf area as compared with old Pakistani varieties. High photosynthetic rate was associated with high transpiration rate, high specific leaf weight and high nitrogen content per leaf area. Percentage of leaf nitrogen content to leaf dry matter was also high in Mexi-Pak.
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Khan et al. (1970) studied this question.
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