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A farmer has noticed that every season his maize crop develops the following problems:
(i) The maize plants become shorter than normal
(ii) The lower leaves turn yellowish.
What should the farmer do to correct the problems in future?
A. Plant maize early in the season.
B. Plant maize using phosphatic fertilizer.
C. Irrigate the maize crop every morning and evening.
D. Apply a nitrogenous fertilizer to the maize early in the season.