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In this article the theoretical method to determine the optimum seeding time of wheat and maize isestablished.For wheat,it is based on the close relationship between accumulated temperature and numberof leaves on the main stalk as well as number of stalks per plant of wheat,and for maize,based on theclimatic potential productivity model of maize.Using these models,we found that the optimum seeding time should be,for winter wheat,decided byaccumulated temperature from seeding date to the beginning of dormancy,and for maize,postponed forabout 30 days for medium variety and about 50 days for early variety in contrast with traditional seedingtime.Besides,through analysing climatic data the agroclimatic pattern of optimum seeding time for bothcrops in Beijing area has been found as well.
In this article the theoretical method to determine the optimum seeding time of wheat and maize isestablished.For wheat, it is based on the close relationship between accumulated temperature and numberof leaves on the main stalk as well as number of stalks per plant of wheat, and for maize, based on theclimatic potential productivity model of maize. we found that the optimum seeding time should be, for winter wheat, decided byaccumulated temperature from seeding date to the beginning of dormancy, and for maize, postponed forabout 30 days for medium variety and about 50 days for early variety in contrast with traditional seeding time.Besides, through analysing climatic data the agroclimatic pattern of optimum seeding time for bothcrops in Beijing area has been found as well.