The ASI method is a good method in evaluating the nutrient supplying properties in soils The soil nutrient status and nutrient limiting factors in three typical litchi plantations located in Zengcheng city Guangzhou,Boluo county in Huizhou,Gaozhou county in Maoming of Guangdong province,respecitively.

The systematic approach for determination soil nutrients, using chemical analysis in laboratory, experiment of adsorption, cultivating in greenhouse and field, which was presented first by Hunter (1980) and modified by Sam Porch (1988), was adopted to study the nutrient limiting factor (NLF) and nutrition specific from two indicator plants (sorghum and sweet pepper) in strong acidic (pH4.

In order to find out the nutrient status,nutrient limiting factors and its deficiency-degree of the dry red soil in Hainan banana garden,the method of systematic study on soil nutrition is employed to analyze the nutrient status of dry red soil in Hainan banana garden.

The results show that the order of main limited factors affecting rice yield planted in the acid yellow paddy soil is N>P>K>Ca>B>Mo and the best fertilizer application formulation for higher rice yield in the tested area is 17.

Annual variation of major nutrients and limiting factors in Laizhou Bay and Sanggou Bay;

To improve and coordinate Limiting factors, water conservancy projects should be set up, population should be strictly controlled, and livestock farming should be beveloped.

Abio phosphor's content is the limit factor deciding red tide's occur.

This paper analyses the potential of cotton by using FAO agriculture zoology calculation method in risk areas,according to the natural resource,estimates and appraises light temperature and calimate potential yield of cotton,compares with reality yield,finds the main limit factor.

This paper analyse the potential yield of cotton by using FAO agricultral zoology cacutation method in ShiHezi,according to the nature resourse of ShiHezi,estimate and appraise light temprature and climate potential yield of cotton,compare with reality yield,finding the main limit factor,it will submit suitable methods of magament and offer basis for agricultrue.