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10 April 1992, Volume 13 Issue 02

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The possible influence of climate getting warmer on agricultural production in China

Cui Duchang(Agrometeorological Institute, Chinese Academy of Agricultural sciences)

1992, 13(02):  16-20. 

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In this paper, the influence of the greenhouse effect to make get warmer all over the world on agricultural production in China, planting regime, reginal production etc. has been discussed. And it points out, because of climate getting warmer, agricultural production faces three main problems in China: 1. The stable supply of agricultural production have to be effected significantly with the increase of instability of agricultural production and wave of food production. 2. Changing over all arrangement and structure of agricultural production in China, to force agricultural production performs adaptability adjust on a large scale. 3. Developing agricultural production conditions (drainage and irrigation equipments, agricultural implements and coordinated techniqus, the quantity used of chemical fertilizer and agricultural chemicals, seed amelioration etc.) and increasing agricultural production costs, we have to increase agricultural investment greatly, to adapt the influence of climate changes.

A MISTAKE IN THE CALCULATION OF COMMUNITY PHOTOSYNTHESIS

Ma Weizeng(Huazhong Agricultural University)

1992, 13(02):  40546-405. 

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A mistake in the calculation of community photosyntheis was pointed out in this paper. It was due to the confusion of light intensities on horizontal plane and leaf surface. The subjects concerned, such as the index law of light distribution in canopy, extinction cofficient etc., were discussed.

IMPACT OF CLIMATIC CONDITION ON THE GRAIN-FILLING PROPERTIES OF HYBRID RICE

Lin Wenxiong Wu ZhiQiang Lian Yiyuan(Fujian Agricultural College)

1992, 13(02):  40641-406. 

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Shanyou 3, Siyou 2 and Shanyou 63 etc. of hybrid rice were used for the studies in 1979-1988. The results were as follows: 1. Hybrid rice Shanyou 3 had two peak periods of grain-filling. It happened respectively at the 12th and the 30th day after anthesis. 2. The duration of grain-filling in hybrid rice consisted of five stages from heading to maturation. The dry matter was accumulated slowly within 0-5 days after the anthesis of Shanyou 3. Adequate unlight and higher temperature were needed for matter production and translocation, the rate of grain-filling was positively correlated with temperature within 19-30℃ at this stage. 27. 3℃ mean daily temperature, 75% R. H. and enough sunshine per day were helpful to grain-filling in 5-10 and 11-15 days after anthesis. But 22. 2℃, 70-80% R. H. and more than 6. 53 hr. per day were optimum for it in late maturation period. If the daily highest temperature (more than 35℃) appeared in 6-10 or 16-20 days after anthesis, setting percentage would markedly decrease. 3. If adverse weather occured or the upper leave of rice withered early at late growing period, the grain-filling of hybrid rice had only on peak, which in turn let to the decreace of setting percentage, 1000-grain weight and yield. So. the anagement of field was very important before harvest.