جستجوی مقالات مرتبط با کلیدواژه "dris" در نشریات گروه "زراعت"

Almond is one of the most important orchards products of Chaharmahal va Bakhtiari Province that the most production is in saman area. The objective of this research was nutritional evaluation of almond gardens using DRIS (Diagnostic Recommendation Integrated System) method. Accurate and balance nutrition of almond are the important factors that improve quality and quantity of yield. Regarding sand texture of soil in almond gardens of region and abound average of rainfall, leaching of nutrients around the root, is one of orchards problem in this province. Proper management of fertilizers is one of the factors that can increase the quantity and quality of almond fruit be effective.

In order to evaluation of almond nutritional requirements an experiment was conducted using of Diagnostic Recommendation Integrated System (DRIS) method in the gardens of zayandeh roud river in a length of 60 kilometers and a data bank was provided. In current research 36 gardens were selected and the leaf samples were prepared. The selected leaf samples were washed and grinded for laboratory analysis. The high yield gardens were selected for preparing reference values at the end of growth season and in this case 30 percents of high yield gardens were chooses. The Diagnostic Recommendation Integrated System (DRIS) indexes were estimated and the nutritional requirement orders were determined.

The results showed that the order of nutritional requirements of the trees was in the following order: Zn>CU>Mn>S>Cl>Ca>B>N>P>Fe>Mg>K>Mo. According to the results, zinc has the most deficiency in almond trees studied. Then there are copper, manganese, sulfur, chlorine, calcium, boron, nitrogen, phosphorus, iron, magnesium and potassium elements, respectively. In other words, the highest amount was obtained for molybdenum, potassium, magnesium, iron, phosphorus, nitrogen, boron, calcium, chlorine, manganese, copper and zinc respectively.

According to the results of the DRIS method and the balance index, the almond gardens studied were not balanced in terms of nutritional status in this study. Among nutrients, micronutrients are scarce due to less use of fertilizers containing it and factors such as steep slope, lightness of soil texture and calcareous of them. And it is necessary to consider and apply necessary measures in order to nutrition needs of almond trees in this area. these actions include: the application of animal fertilizers, the use of a variety of micro-nutrient fertilizers, the use of acidic substances with irrigation water, preferably drip irrigation to improve the calcareous properties of soils and consequently, to increase the absorption capacity of micronutrients.Finally, it can be said that the DRIS method is an effective method for determining the nutritional needs of almond gardens in these areas and is applicable.