| Abstrakt: |
The partial raw sugarcane system (SCCP) involves the partial removal of sugarcane straw for the production of bioenergy. Our objective was to verify the possibility of increasing the longevity of the cane field in the partial cane system, based on evaluations of soil fertility, plant nutrient content, and productivity. A randomized block design was used in very clayey, Eutropheric Red Latosol, with three replications and five residual amounts of straw (0, 5, 10, 15, and 20 Mg ha−1). The TOC; pH; H + Al3+, P, Ca, Mg, K, and CTC (T) content; V%; Ca, Mg, and K saturations in CTC (T); levels of macro and micronutrients (N, P, K, Ca, Mg, Cu, Mn, and Zn) in sugarcane leaves; and the productivity of stalks and sugar were analyzed for two harvests. The results of each harvest were subjected to regression (p < 0.10) and joint data analyses to clarify crop interaction with each treatment of residual straw. The results indicate that the effects on the chemical properties of soil were only in the current crop and not recurrent in the subsequent crop cycles. Regarding plant nutrients, only increases in Mn levels and a decrease in Zn levels were found. There was no increase in the productivity of stalks and sugar. Therefore, we conclude that under the SCCP there is no possibility of increasing the longevity of sugarcane fields or postponing the fallow period of crops grown in clayey soils. [ABSTRACT FROM AUTHOR] |
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