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10 June 1996, Volume 17 Issue 03

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Determination And Application of Soil Water Characteristic Curve of Cinnamon Soil in East Mountainous Areas in the Middle,Shanxi Province

Zhong Zhaozhan;Zhao Jubao;Xue Junhong; Mel Xurong(Agrometeorological Institutc,CAAS,Beijing 100081)

1996, 17(03):  . 

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Uscd by the pressure membrane method,determined the soil water characteristic curve of cinna-mon soil in the east mountainous areas of middle Shanxi province,and analyzed the dynamic charac-teristic of soil water energy,The results show that in these areas.the relationship between the soil suc-tion and the soil water content could be simulated with the power function;the distribution of soil e-qu ivalent pore diameter decreases as the soil suction increases,the porcentage of soil equivalent porediameter of aeration porcoity, capillary porcoity and inactive porcaity to total soil porosity is 18.3%,51.2%and 30.5%respectively,which that means the soil in these areas has a good structure andfunction,especially the soil capillary porosity takes up over half of the total soil porosity,which pro-vides the soil with a favorable condition for the soil water storage,soil moisture maintenance and ef-fective crop utilization to soil water; specific soil water capacity decreases rapidly as the soil suction in-creases , the dimension degree of specific soil water capacity is 10-1(ml/105pa·g)when the soil suc-tion is 0.1×105～0. 3× 105pa, and 10-3(ml/105pa·g)when soil suction is 3× 105～15× 105pa. Thewater in topsoil is more effective than that in subsoil and undersoil, whereas the water retention a-bility of undersoil is greater than that of topsoil,which indicates that the water held in undersoil mustbe utilized futther,in order to ensure agriculture in these dry farming areas develop in a sustainable,steady way.

Study on the Relation Between the Production of Sweet potato and Meteorological Conditions in Southeast of Fujian

Zheng Haiqing Wang Yuqua(Meteorological Research Institutc of Fujian, Fuzhou 350001)

1996, 17(03):  . 

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Thls poper,based on the agrometeorological data and the sweet potato's field trial in Jinjang andPutian county, during the period from 1 983 to 1 994,it imitated the growth cure of lumps of sweetpotato and its accumunated rate,it was given a critical peried of sweet potato, Analysing the relationbetween the sweet potato's yield and soil moisture,it shows that summer drought or summer- autumndrought in July- October is a key factor for sweet potato's yield.Analysed the ralation betwecn num-bers of landing typhoon and sweet potato's yield harvestFinally, puting forward the measurs to lightenthe harmness of drought.

Water Supply Regime to Winter Wheat on he Level Terraces in the Nonthwestern Loess Plateau

Tao Shiheng; Wang Lixiang;Hu Xiyuan(Northwest Agricultural University,Yangling,Shaanxi 712100)

1996, 17(03):  . 

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The differences of water supply regimes to winter wheats between the level terraces and the plainwere studied by means of error analysis.The intiuences of the variations bofh of the water storage ratein the level terraces and of the water requirement of wheat on the water regime are discussed. It is mainly the increase of the water requirement of wheat that worsens the water supply re8ime in terracedfields, The modified coefficients of water supply to winter wheats are calculated for the level terraceswith various gradients in the northwestern Loess Plataeu.