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Leaf samples, raised on the N-deficient and N-abundant sand and sprayed with varying concentration of urea, were analized for their total chlorophyll concentration. It was observed that the depression periods of the chlorophyll content appeared at first by spraying with urea; it appeared on the 3rd day in the N-deficient plots and on the 6th day in the N-abundant plots. Causes of the depression of chlorophyll may be assumed to be in an excessive urea, an accumulation of ammonia from urea absorbed, and depression of water content owing to urea application. The maximum content of the chlorophyll was shown on the 6th day in N-deficient and on the 12th day in the N-abundant plots. The young leaves activity formed the chlorophyll by urea foliar spray, compared with the mature ones. This result was consistent with previous paper.
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