PJB-2018-78
EFFECT OF ENVIRONMENT AND INVESTMENT ON WINTER WHEAT PRODUCTION ON THE LOESS PLATEAU OF CHINA
MUSLIM QADIR
Abstract
Human investment and environmental changes exhibit great impacts on winter wheat production. In present paper winter wheat yield adjusted into environment yield and investment yield, to evaluate the effects of environment and investment on winter wheat production on the Loess Plateau of China. The results showed the mean value of environment yield at period IV was 851 kg/hm2, with the RE value of 25.6% and during the last 57 years the impacts of environment change on winter wheat yield were negligible. However, the climate changes, particularly fluctuations in the precipitation cycle caused the variation in winter wheat yield/year. In addition the investment yield of winter wheat at period IV was 2663 kg/hm2, with the RI value of 74.4%. Therefore, it is inferred that investment was one of the main reasons which increased winter wheat yield from 1965 to 2014 on the Loess Plateau of China; while RI values were lower during prolonged drought seasons. Consequently we conclude that the impacts of investment on winter wheat yield were limited by the environmental factors especially by rainfall on the Loess Plateau of China.
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