Strategies for fertilization with pig and cattle slurry in wheat crop/Estrategias para adubacao com dejeto liquido de suino e de bovino na cultura do trigo

This study aimed to evaluate the effect of different managements with pig slurry (PS) and cattle slurry (CS) on wheat dry matter and grain yields, and the potential to estimate this variation with the NDVI (normalized difference vegetation index) and NDRE (normalized difference red edge index) vegetation indices. The experiment was conducted in Frederico Westphalen-RS, Brazil, in a randomized block experimental design, in a 2 x 7 factorial scheme with four replicates and seven forms of surface and subsurface application, with and without the use of the dicyandiamide (DCD) nitrification inhibitor, distributed as follows: control without application of slurry and DCD; control without application of slurry and DCD, but scarified only with the injection machine; surface application; surface application with DCD; subsurface injection; subsurface injection with DCD; and application of NPK in mineral form. At flowering of the wheat crop, dry matter was collected and readings of NDVI and NDRE were taken, and finally grain yield was quantified. For PS and CS, best results of dry matter and grain yields were found in managements with subsurface injection and subsurface injection with DCD, respectively. Among the vegetation indices, only NDVI was efficient to estimate variations in the management using CS for wheat dry matter and grain yields. Key words: Triticum aestivum L. organic waste NDVI NDRE Este estudo teve como objetivo avaliar o efeito de diferentes manejos com dejeto liquido de suino (DLS) e bovino (DLB) na produtividade de materia seca e de graos da cultura do trigo e o potencial de estimativa dessa variacao com os indices de vegetacao NDVI (indice de vegetacao da diferenca normalizada) e NDRE (indice de vegetacao da diferenca normalizada pelo red-edge). O experimento foi conduzido em Frederico Westphalen, RS, no delineamento experimental blocos ao acaso, em esquema fatorial 2 x 7, com quatro repeticoes, sendo duas fontes (DLS e DLB) e sete formas de aplicacao superficial e subsuperficial, com e sem o uso de dicianodiamida (DCD), ficando assim distribuidos: testemunha sem aplicacao de dejetos e DCD; testemunha sem aplicacao de dejetos e DCD, porem apenas escarificada com a maquina de injecao; aplicacao dos dejetos em superficie; aplicacao dos dejetos em superficie com DCD; injecao dos dejetos em subsuperficie; injecao dos dejetos em subsuperficie com DCD; e aplicacao de NPK na forma mineral. No florescimento da cultura do trigo, realizou-se a coleta de ma