Evaluation of Soil Fertility Status of Indian Lac Research Institute Farm Namkum, Ranchi

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Birsa Agricultural University, Ranchi
to 5.85) irrespective of the land situations, and grouped into three classes viz., very strongly acidic (7.4%), strongly acidic (81.5%) and mode rately acidic (11.1). soil pH in in KCl was much less than PH in water showing considerable amount of residual acidity. PH (KCl) had a significant negative correlation (r = -0.70) dth exchange acidity. The A pH values were all positive indicating the presence of negatively charged soil colloids. The exchange acidities of all the soils had been contributed by both Exah. H* and Al3+ ions but about 66 to 74 per cent of the total exchange acidity was due to Exch. Al +3. There was a highly significant positive relation between exchange acidity and bech. Al3 (r= 0.01). The amount of extrac table aluminum was higher than that of ach, aluminum content. In general, the fertility status of the farm was medium. However, the soil was low in respect of organic matter and available nitrogen, modium in available ? and K, high in available sulphur and DP-micronutrients. Calcium was reckoned as very deficient and to some extent in magnesium,soil Nutrient Index (NI) has been calculated for N, P, K which was low, high and medium, respectively. Out of 9 nutrient rating classes, the most dominant one was LMM in respect of N, P and K respectively followed by LIX class. Besides, profile studies revealed that soils were sandy clay loam, acidic (pH 5.2-6.1) and the acidity decreased ad th depth. Exchange acidity decreased with depth from 0.30 to 0.05 m.e./100 g. Exch. A13 was more than exch. H ions but acidity was due to extractable Al which decreased with depth. Organic matter and avail. N +3 was very low and decreased wd th depth. As regards available P. except the last horizon all the other horisone have medium range (9-22 kg P ha). Available K was medium, avail. S was higher in bunded medium land than in upland soils but it was well supplied in the soil and the DIPA micronutrients were well supplied throughout the profile and decreased with depth.