Growth performance, root morphology and phosphorous upake of `Szinkom' (Citrus reticulata L.) in degraded soil amended with rock phosphate
2002
Cotubao, J.T. | Jadina, B.C. (Leyte State Univ., Visca, Baybay, Leyte 6521 (Philippines). Dept. of Agronomy and Soil Science)
Soil degradation is a serious problem in our country at present and if not mitigated will still be a problem in the future. Hectarage of degraded soils in increasing unabated. About 10 M hectares of degraded land which results due to mismanagement like kaingin, logging, inappropriate cropping practices and others remain infertile and unproductive. Despite the problems (e.g. nutrient deficiencies) pose by soil degradation, farmers still utilize these soils for crop production. An experiment was conducted in a chemically degraded soil (acidic soil) to determine the effects of different rates of rock phosphate (RP) application on the growth, root morphology and phosphorus uptake of `szinkom', and to find out the effect of rock phosphate on some chemical properties of the soil. Results showed that plant height and number of functional leaves of the test crop were significantly affected by rock phosphate application. Application of 1.0 g P from RP/kg soil resulted to taller plants and more number of functional leaves produced. Moreover, longest root length and highest number of root tips/plants were also noted at the same P level. Furthermore, significantly higher phosphorus uptake was observed at the highest P level (1.0 g P from RP/kg soil). Chemical properties of the soil particularly soil extractable phosphorus was significantly increased with the application of 1.0 g P from RP/kg soil. Highest extractable P of 52.0 mg/kg soil was observed at the highest P level. It can also be noted that soil pH increased with an increase in rock phosphate application
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