Establishing diagnosis and recommendation integrated system (DRIS) for industrial use of tomato

Abstract

This study aimed to establish DRIS norms for industry tomato plants cultivated in Goiânia city (Goiás State, Brazil). The soil was prepared by one plowing and one disk harrow leveling. Chemical analysis of nutrients were done the fourth leaf from the apex of the stems of plants. The diagnostic leaves were collected at 64 days after transplant. The levels of NH4+, H2PO4-, K+, Ca2+, Mg2+, SO42-, H3BO3-, Cu2+, Fe2+, Mn2+ and Zn2+ present in the leaves were evaluated in 25 genotypes of industrial tomato. Two levels of tomato yield were used for establishing a database with all binary relationships among all nutrients studied up to 48 t ha-1 of tomato fruits. The averages for each concentration of nutrient were calculated and they were used in each genotype. The nutrutional content of each nutrient and the nutrient balance index (IBN) of each production level were calculated. The industrial tomato genotypes differ in nutrient absorption efficiency. The deficiency order to high yield group plants (> 48 t ha-1) was P > N > Mn > Ca > K > B > Zn > Cu > N > Mg > S The deficiency order to low yield group plants (< 48 t ha-1) was S > Fe > Cu > Zn > K > N > P > Mn > Mg > Ca > B. The CVR 1 inbred lines, CVR 3, CVR 4, CVR 5, CVR 21 and CVR 22 are productive and efficient in the absorption of N, P and K.