Growth of urochloa irrigated in clayey and sandy soil submitted to nutritional management in the cerrado

Abstract

The reduction in water supply in specific areas and the high costs of agricultural inputs resulted in the need for agronomic management capable of reducing the pressure on water resources and promoting economic development. The objective of this work was to evaluate the response of Urochloa brizantha cv. Marandu grown in clayey and sandy soils submitted to nutritional and water management in the municipality of Rio Verde, state of Goiás. The treatments consist in combining two levels of fertilization (A1: 30, 7 and 36 and A2: 45, 10.5 and 54 of NPK per Mg of DM produced,) and seven water depths (0%; 25%; 50%; 75%; 100%; 125% and 150% of crop evapotranspiration (ETc)), in four replications. Crop performance was evaluated employing SPAD index, plant height, leaf length, leaf width, neutral detergent crude fiber, and dry matter. The rise in the irrigation depths significantly affected the performance of the forage and despite not having a significant difference, the production of dry matter may be higher when in soil with A2 fertilization. A significant influence was observed in the number of seedlings emergence from 7 to 21 days in Sandy soil as a function of clayey soil, on chlorophyll, and plant height as a function of A2 fertilization concerning A1 and irrigation depths in all analyzed variables.