Nutrient status of selected degraded upland soils in Samar island

IMG_4925Leo Jude D. Villasica* and Victor B. Asio, 2013 *(leojudev@gmail.com)

ABSTRACT

Due to the low productivity of degraded uplands, this study focused on the evaluation of the nutrient status of two degraded upland soils in Samar island namely, Brgy. Tulay, Sta. Rita, Western Samar and Brgy. Naparaan, Salcedo Eastern Samar. Soil monitoring plots were established in the farmer’s field planted to various crops. The soil nutrient status was evaluated by periodic sampling and analysis of the soil pH, OM, total N, available P, exchangeable bases, readily mineralizable C and N, plant nutrient concentration and microbial activity by soil respiration.

Results revealed that the nutrient status of the degraded uplands in Sta. Rita and Salcedo are low. In general, the low nutrient status is more severe in the Salcedo site than in the Sta. Rita site which is related to the more weathered nature of the former than the latter. Moreover, both sites have strongly acidic soil which is low in OM, total N, available P, and exchangeable bases contents. The low nutrient status of the soil is reflected by the low leaf concentration of the nutrients (N, P, K, Ca). Also, the low nutrient status is observable from the low respiration rate and low levels of readily mineralizable C and N. Considerable variations in nutrient status is observable under different vegetation covers.

Keywords: nutrient status, degraded uplands, vegetation cover, Samar Island

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