Evaluation of nutrient status in the rice growing areas of the Punjab [Pakistan]
2003
Ahmad, N. (Soil and Water Testing Lab., Multan (Pakistan)) | Abid, M. | Hussain, K. | Akram, M. | Yousaf, M.
The study was carried out to assess the macro and micro nutrients status and their relation with pH, organic matter, clay contents and calcium carbonate (CaCO3) in the rice growing areas (Kallar track). Soil samples from 0-15 cm depth were collected from 45- 50 sites located in this area. The soil samples were processed and analyzed for macro and micronutrients. Results indicated that 40% soil samples were deficient in total N, 17.77% P, 4.41% SO4, 60% Zn, 4.5% Cu and 13.33% Mn. The K, Ca + Mg, Fe and B were not deficient. About 15.15% were low in total N, 33.33 in P, 6.66% in SO4(-2)-S and 22.22% in Zn and no one in K, Ca + Mg, Cu, Fe, Mn and B. Soil pH, organic matter, clay and CaCO3 contents were correlated with macro and DTPA (diethyletriaminepenta-acetic acid) extractable available micronutrients. Organic matter showed positive correlation with N (0.969*], whereas pH8 correlated negative with Mn (-0.316]. Clay contents showed significant positive correlation with K (0.325], Cu (0.372] and B (0.269]. Similarly, significant positive correlation of CaCO3 was recorded with Cu (0.415] and Mn (0.360].
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Эту запись предоставил National Agricultural Research Centre