Phosphorus Nutrition of Sugarcane: Growth, Yield and Quality of Sugarcane as Affected by Soil Phosphorus Levels.

概要

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The aim of these studies was to analyse the growth, yield and quality of sugarcane as affected by soil phosphorus levels, viz. 7.1, 11.2, 17.0 and 21.0 mg available P2O5⋅100g-1soil designated as A, B, C and D levels, respectively. Leaf area index and dry matter production increased at higher soil P levels than at lower levels. Horizontal and vertical distribution of roots was directly related to soil P levels. Significantly, the maximum cane yield of 76 t⋅ha-1was obtained from higher P soils while the minimum yield of 53 t⋅ha-1from the low P soils. Significantly, the highest sugar yield of 12 t⋅ha-1was produced from the B level of soil P followed by the C level while the lowest yield of 8 t⋅ha-1was produced from the A level. Higher absorption of N in cane leaf at the D level of soil P at the maturity stage may have led to the low accumulation of sugar compared with the B and C levels of P. Among the other nutrient elements, Zn and Cu contents were also found to decrease significantly in the leaves at the D level of soil P compared with the A level. It was assumed that too high soil P level prevented Zn and Cu absorption by sugarcane. Thus, by maintaining the available soil P level between 11 and 17 mg P2O5⋅100 g-1soil, the growth, yield and quality of sugarcane could be improved.
日本熱帯農業学会の論文