جستجوی مقالات مرتبط با کلیدواژه "شاخص تعادل تغذیه ای" در نشریات گروه "آب و خاک"

The aim of this study was to evaluate the nutritional status of dryland wheat using diagnosis, and recommendation integrated system (DRIS) method. To determine the DRIS indices, and norms in dryland wheat, 54 samples were collected from shoots, and concentrations of nutrients nitrogen (N), phosphorus (P), potassium (K), iron (Fe), manganese (Mn), copper (Cu), and zinc (Zn) were determined. To determine the norms, the farms were divided into two groups of high and low-yielding farms based on yield. Optimum concentrations of nutrients for macronutrients N, P, and K were 0.87- 1.35, 0.0360 - 0.104, 2.18 - 1.02 (%), and for micronutrients including Fe, Mn, Cu, and Zn were 170-430, 29-51, 3.6 – 8.4, 13 – 27 (mg kg-1), respectively, as well as optimum nutrient concentrations for N, P, and K were 1.11, 0.07 and 1.6 (%), and for Fe, Mn, Cu, and Zn 300, 40, 6, and 20 (mg kg-1) respectively, were determined. In most low-yielding farms, the nutritional balance index (NBI) was much higher than zero, indicating more nutrient imbalance in these farms. The overall priority for macro and micronutrients is P > K > Fe > N > Mn > Zn > Cu, which should be paid attention to P, K, Fe, and N in the nutritional program.

 Deviation from the optimum percentage (DOP) is an important method for interpretation of the results of chemical analysis and diagnosis of nutritional status of plants. In order to evaluate the nutritional status of squash (Lagenaria Vulgaris) through DOP, 122 leaf samples were collected from squash fields of Khoy region and N, P, K, Ca, Mg, Fe, Mn, Zn, Cu and B were analyzed. The squash fields were divided into high and low yielding groups. The mean of nutrients concentration in high yielding-fields was selected as norms for the calculation of DOP indices. DOP indices showed that macro- and micro nutrients requirement as follow K>P>Mg>Ca>N and Zn>Fe>B>Cu>Mn respectively. So nitrogen had the most positive index but potassium and zinc had the most negative indices among nutrients. DOP nutritional balance index was much more than zero indicating nutritional imbalance in this region. Finally, it was concluded that K and Zn deficiencies are more critical in reduction of the squash yield and the application of their fertilizers can improve growth and yield of squash in the region.

Diagnosis and recommendation integrated system (DRIS) can be used as efficient methods to interpret the results of plant analysis and the nutritional diagnosis in crops and fruit trees. To establish DRIS norms in onion (Allium cepa L) leaf samples were collected from 50 fields and N, P, K, Ca, Mg, Fe, Mn, Zn, Cu and B concentrations were determined. On the bases of yield, the studied fields were divided into two groups low and high yield groups. DRIS norms were established for the different nutrient ratios. DRIS indices were calculated to evaluate nutrients balances and order of nutrients requirements. On the bases Means of DRIS indexs, the respective for requiremen of nutrients were Ca>K>P>Mg>N for macro nutrients and Cu>Mn>B>Zn>Fe for micro nutrients. Sufficiency ranges of macro and micro nutrients were derived by DRIS technique. DRIS-derived sufficiency ranges were 2.9-3.68, 0.21-0.39, 3.7-6.4, 1.38-2.6 , 0.23-0.33 % for N, P, N, Ca, Mg, and 86-154, 9-32, 44-65, 9-18, 23-35 mg/kg for Fe, Zn, Mn, Cu, B respectively. The nutrient balance index (NBI) of DRIS was much more than zero in all low-yielding farms.

Diagnosis and recommendation integrated system (DRIS) and deviation from optimum percentage (DOP) index can be used as efficient methods to interpret the results of plant analysis and the nutritional diagnosis in crops and fruit trees. To establish DRIS norms in seedless grape (Sultana, cv) and compare them with DOP index, leaf samples were collected from 129 vineyards and analyzed for N, P, K, Ca, Mg, Fe, Mn, Zn, Cu and B concentrations. The sugar content (brix) of the grape juice was measured as a criterion of yield. On the basis of sugar content, the vineyards were divided into two groups of low and high yielding populations. Standard DRIS norms were established for the different nutrient ratios. DRIS indices were calculated to evaluate nutrients balances and order of nutrients requirements. Sufficiency ranges of macro and micro nutrients were derived by DRIS technique. Means of nutrients concentrations in the high yielding population (high sugar content) were used as reference values for calculating DOP indices. DRIS-derived sufficiency ranges were 2.0-2.8, 0.20-0.27, 1.2-1.7, 1.5-2.1% for,respectively, N, P, K, Ca, and Mg, and 55-138, 40-127, 30-100, 10-20, 30-187 mg/kg for Fe, Mn, Zn, Cu, and B, respectively. DRIS indices showed that, among the macro and micro nutrients in all low yielding vineyards, magnesium and zinc had the most negative index values, respectively. The nutritional balance index (NBI) of DRIS and of DOP (SDOP) were much more than zero in all low-yielding vineyards, indicating that there was imbalance between the absorbed nutrients by grape vines. Comparison of the DRIS indices for the macro and micro nutrients with the DOP indices revealed that Mg and Zn were the most deficient elements in all low-yielding vineyards showing that both methods provide similar information in the interpretation of the results of leaf analysis. To validate DRIS norms and verify the efficiency of DRIS and DOP as methods for improving the interpretation of analysis results of grape leaf, fertilizer experiments should be conducted on seedless grape in a low-yielding vineyard.