Resumo

PINNA CABREJOS, J.; VALDIVIA SALAZAR, S.  e  VALDIVIA VEGA, S.. Nitrogen Fertilization, Age at Harvesting and Quality of Sugarcane in a Moderately Saline Soil. Agrociencia Uruguay [online]. 2019, vol.23, n.2, pp.62-73.  Epub 01-Dez-2019. ISSN 1510-0839.  https://doi.org/10.31285/agro.23.81.

This study was carried out in the Zapote C-D field, belonging to Agro Industrial Tumán company, localized in Peruvian northern coast, Lambayeque Department. In this moderately saline field (1.98-8.66 dSm-1), five N rates (180, 250, 320, 390,460 kg N ha-1) per age, with four replications and one control plot without N per age were studied, at five harvesting ages (12.3, 15.5, 20.0, 23.3, 26.5 months). The sugarcane cultivar H32-8560 (cane plant) was developed. In each harvest, an analysis of the quality of the cane was carried out: sucrose, brix, purity, reducing sugars, fiber and humidity. An Analysis of Variance was carried out to study the effect of N doses and cane age on quality. The quality results were related (via regression analysis) with the average salinity of the first 60 cm of the soil, of each plot, to the plantation, with the doses of N, and with the age of the cane. It was found that the applications of N did not affect the quality of the cane. The moderate salinity of the soil before planting was not related to any quality characteristic of the cane. The quality was not affected, either by the doses of nitrogen or by the salinity of the soil. The quality of the cane varied with the age of the plantation at the time of harvest, presenting a behavior similar to that in non-saline soils. The lack of water did not affect the ripening of the cane.

Palavras-chave : arid soils; alluvial soils; salinity; fertilization; sucrose.

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