Chinese Journal of Agrometeorology

A STUDY ON THE RELATIONSHIP BETWEEN SPRING CORN YIELDS AND CONSUMPTIVE USE OF WATER IN THE WEST OF WEI-BEI RAINFED TABLELAND

Liu Wenzhao Li Yushan (Northwestern Institute of Soil and Water Conservation, Academia Sinica)

1990, 11(04): 14-18.

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Based on the data of field experiments in Changwu County, located in the west of weibei tableland, this paper deals with the relationship between corn yields and consumptive use of water. The preliminary studies showt1. There is a significant difference at 1 percent level for corn yields among different treatments of water supply.2. At various level of water treatments, there is a parabola relationship beteen yields and consumptive use of water.3. Under different fertility levels, the relationships between relative crop yields and relative consumptive use of water are identical, that is, Yr =-4.292+10.586Xr-5.293Xr~2 where Yr—relative crop yields Xr—relative consumptive use of water

ON THE RELATIONSHIP BETWEEN CLIMATE AND AGRICULTURAL PRODUCTION DEVELOPMENT

Cui Duchang (Agrometeorological Institute, Chinese Academy of Agricultural Sciences, Beijing)

1990, 11(04): 40547-405.

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The effects of climate on agricultural production development were analysed and researched in this. paper. The climatic variability in China is a main factor causing the instability of agricultural production. 60 percent of agricultural disastrous area per year is caused by drought, potential effects of other disadvantageous climatic factors may cause food production to decreaes by over 5 million tons. In the condition of 5 percent yield variability, the lose of fluctuation for total food production in 1970's is great more than the lose in 1950'$. In the same conditions of policy, seeds and farming techiques etc., food yield is mainly limited by climatic factors with the development of agricultural production, the reletionship between climate and agricultual production become more and more close. In making agricultural developing strategies, the climatic variability should be taken into accout.

A PRELIMINARY STUDY ON THE RELATIONSHIPS BETWEEN CLIMATIC DAMAGE AND FOOD PRODUCTION AND COUNTERMEASURE IN ZHEJIANG PROVINCE

Zhou Zikang (Hangzhou University)

1990, 11(04): 40672-406.

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This paper is a study based on the food crops yield data (1949—1988) of per unit area in Zhejiang Province. By using the analysis of spectrum cycle, it analyses the relationships between poor harvest or grievous poor harvest years and climatic damage, and its changes with time. It tries to make the prediction of climatic damage years and its food crops yeild of per unit area. It also advances some corresponding counterm easures.

THE FORECAST OF THE AGROCLIMATIC CONDITIONS AFTER CUT-OFF THE MANJIANG RIVER

Chen Tieru Wu Zhongling Yao Yuli (Jilin Agricultural University)

1990, 11(04): 40829-408.

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The paper determines limits and degree of influence of the Manjiang river on climate of some areas of the two banks and forecast the agroclimatic conditions after cut-off the Manjiang river by a series of calculation of "height correction" and "range excision segmentation" of determination data of agrometeorological elements of the two banks of the Manjiang river.

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