Sugarcane Yields as Related to Acidity of a Humid Tropic Ultisol
1967
Abruña-Rodríguez, Fernando | Vicente-Chadler, José
Sugarcane was grown in 40 plots with widely varying pH, base saturation, and exchangeable aluminum contents which resulted from applications of 0 to 45 metric tons of limestone per hectare over a previous 7-year period while in other crops, receiving a total of 4,180 kg of N, 545 kg of P, and 3,860 kg of K per hectare. Cane yields, sucrose content of the juice, and foliar composition of the leaves were determined. Soil in all plots of this typical ultisol (Cialitos clay) was sampled at end of the experiment. Cane yields increased with increasing exchangeable base content in the upper 15 cm of soil from less than 25 metric tons per hectare when exchangeable bases dropped below 3 meq to over 100 metric tons when exchangeable bases exceeded 8 meq/100 g of soil (58% base saturation). Cane yields increased with decreasing exchangeable A1 from less than 25 metric tons per hectare when exchangeable A1 exceeded 8 meq to over 100 metric tons per hectare when exchangeable AI was less than 2 meq/100 g of soil. Yields increased sharply with increasing soil pH. Foliar composition and sucrose content of the sugarcane was not affected by the soil factors studied.
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