Resumo

VALDIVIA VEGA, Sergio; PINNA CABREJOS, Jorge  e  VALDIVIA SALAZAR, Sergio. Phosphorus Balance in a Saline soil Cultivated with Sugar Beet (Beta vulgaris L. subsp. Vulgaris var. altissima Döll). Cienc. Tecnol. Agropecuaria [online]. 2022, vol.23, n.3, e2614.  Epub 30-Ago-2022. ISSN 0122-8706.  https://doi.org/10.21930/rcta.vol23_num3_art:2614.

In irrigated valleys of Peruvian arid coast, on more than 30% of its area, soils are affected by salinity or bad drainage, and do not allows sugarcane development because that crop has low salinity tolerance. Sugar beet is an alternative sugar crop and is a proved crop with tolerance to high soil salts concentration, furthermore, its roots can store more sucrose (over 18% of its fresh weigh) than sugarcane and can produce more sugar per hectare year. The objective of present work was to quantify soil phosphorus balance in order to know if it is necessary the application of this nutrient in sugar beet. In this experiment five sugar beet mono- germ cultivars were evaluated. The study was carried out in alluvial soils (Entisols) that are highly saline (5.38 to 22.5dS/m), located at sugar cane enterprise Casa Grande. The experiment utilized a complete randomized block design with five treatments and six replications. Irrigation was with well water, and fertilization was with urea (180 kg/ha of N). It was found that in these marginal soils, sugar beets produce high root yields (81.73 t/ha) for sugar or alcohol production. P gains and loses balance shows that 94.4 kg/ha of P are incorporated to soil and 63.52 kg/ha of P are lost. Gains win to lost in 30.88 kg/ha of P, suggesting that it is not necessary the application of this nutrient in these soils, and in this crop.

Palavras-chave : Cultivars; Irrigated Valley; Nutrients; Peruvian coast; Saline Soil.

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