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The Influence of Lime and Phosphorus on Soil Nutrient Dynamics and Peanut (Arachis hypogaea L.) Yield
Thesis Abstract:
Soil nutrient dynamics as affected by lime and phosphorus fertilizer at three different rates on three acid soils, namely: Annam clay, Alaminos silt loam, and Antipolo sandy clay loam, were studied using peanut (Arachis hypogaea L.) as test crop. A pot experiment was performed at the screen house of the· Department of Soil Science, College of Agriculture, Central Luzon State University, Muñoz, Nueva Ecija, Northern Philippines from February to May 1990.
The soils were adjusted to pH 6.4 and pH 7.2, and treated with phosphorus at 0, 60, and 120 kg P2P5/ ha. Soil samples were collected 45 and 109 days after planting (DAP) for analysis of pH, organic matter, exchangeable potassium (K), calcium (Ca), aluminum (AI), and available phosphorus (P).
The best peanut yield was obtained from Anti polo sandy clay loam followed by Annam clay and Alaminos silt loam. Lime and P improved yield only in Antipolo sandy clay loam. In this soil, application of 120 kg P2P5/ha or pH adjustment to 6.4 significantly increased seed yield.
Lime, P, or their combination increased soil pH in all soil types, with lime exerting a more pronounced effect. Adjusting the pH to 6.4 increased available P only in Antipolo sandy clay loam . Lime or P increased exchangeable Ca at 45 DAP; however, the level of Ca subsided to the initial level at 109 DAP.
These amendments decreased exchangeable A I such that at harvest, only the unlimed treatments contained this mineral. At 45 DAP, exchangeable K increased by 4-5 times in all treatments in all soils except Alaminos silt loam. The added soil amendments, however, did not affect nitrogen, P, Ca, and magnesium concentrations of the above ground plant parts and highest nutrient uptake occurred in Antipolo sandy clay loam.
Available P and exchangeable Ca were strongly correlated with dry matter yield and seed yield at 45 DAP whereas at 109 DAP, only exchangeable Ca was correlated with seed weight.