Document Type : Research Paper
Authors
1
Department of Agronomy, Khuzestan sugarcane research and training institute, Ahvaz, Iran.
2
Department of Agronomy, Khuzestan sugarcane research and training institute
3
Hakim Farabi Agro-Industry CO., Khuzestan, Iran
4
Department of Agronomy, Khuzestan sugarcane research and training institute, Ahvaz, Iran
5
Mirza Kochuk Khan Agro-Industry CO., Khuzestan, Iran
Abstract
Nutritional balance of plants is one of the most important factors which affect the quantitative and qualitative yield of plants. The method of deviation from optimum percentage (DOP) is one of the suitable methods in interpret the results of the nutrients analysis in plants, the nutrients requirements and the nutritional balance status in plants. The objective of this study was to evaluate the nutritional status of sugarcane by the DOP methods in 25 plant fields, 72 first ratoon fields and 44 second ratoon fields in Hakim Farabi Agro-Industry in Khuzestan. Leaf samples collected from studied fields and concentration of nitrogen (N), phosphorus (P), potassium (K), calcium (Ca), magnesium (Mg), iron (Fe), manganese (Mn), zinc (Zn) and copper (Cu) were measured. In order to interpret the nutrient concentration data and assess the nutritional status of sugarcane, the fields were divided into two groups with high and low yield. Then nutrient norms, nutrient DOP indices and nutritional balance index (∑DOP) were calculated. The results indicated that in the low-yield fields, among macronutrients K and P had the greatest negative indices and among the micronutrients Fe and Zn the greatest negative indices. Based on DOP indices, the order of plant nutrients requirement in low-yield plant fields were as K>P>Mg>Ca>N, in the first ratoon were as, K>P>N>Mg>Ca and in the second ratoon were as P>K>N>Mg>Ca. In general, the nutritional balance index calculated for low-yield sugarcane fields indicated that the imbalance of nutritional in sugarcane fields and imbalance fertilizer application in these fields.
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