|Title:||果園土壤及葉片營養診斷資訊系統之初擬||Other Titles:||Soil and Leaf Diagnosis Information System for Orchard in Taiwan : A Proposal||Authors:||陳琦玲
|Issue Date:||May-1989||Publisher:||農業試驗所||Start page/Pages:||85-115||Source:||農業試驗所特刊第28號||Conference:||果園作物營養診斷應用研習會專輯||Abstract:||
The soil and leaf diagnosis information system is established using the ET Chinese system package and clipper database management system package. The system consists of an orchard data bank and two application programs.
The data bank provides: 1) 37 items to cover the data of growth fertilization and other management practices, 2) 10 items to cover the data of various nutrient concentration in leaves, 3) 27 items to cover the data of various soil properties and fertility in the profile layers of 0~20, 20~40, 40~60 cm. It also provides 3 items to cover the serial number of orchard and samples of leaf and soil. con sequently, there are total of 77 items for each orchard in the data bank.
One of the application programs is for the diagnosis of nutrition and recommendation. The principles of diagnosis and recommendation are based mainly on the judgement of nutrient status comparing the nutrient concentrations of leaves to be diagnosed with those of the optimum nutrient criteria established¡¦ and the existence of de ficient symptoms on the leaves or the informations provided by the local a gents. Some soil properties related to fertility as well as current rates of fertilization are also taken into account in recommending fertilizer and management practices. There are eight kinds of fruit trees, namely, citrus, grape, pear, loquat, carambola, mango, wax apple and custard apple in the program at present. The nutrient elements to be diagnosed are nitrogen, phosphorus, potassium, calcium, magnesium, boron, copper, iron, manganese and zinc. The optimum nutrient criteria for each kinds of trees should be based on the results of long term fertilization experiments and field surveys con ducted for each kinds of trees in this country. However, except citrus most of the criteria are adapted from foreign countries, due to insufficiency of local data available. Consequently they are subject to be confirmed further and should be revised after more field experiments and surveys conducted.
Another program is for the statistics of percentage distributions of the rates of chemical fertilizers applied, the status of fertility in the soil as well as that of nutrient in the trees. The time-consuming work of diagnosis and complicated calculation in statisticsc an be simplifed and speeded up using the programs. The system conducted in Chinese can be accepted easily by the local farmer and agents. And the informations acquaired from the system will be a basis for the management of fertility and plant nutrition in the orcha rds. The system will provide more meaningful informations for the farmers as well as researchers by extending the capacity of the data bank and improving the design of program with more experimental data obtained further.
|Appears in Collections:||農業化學組|
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