Diagnose por subtração de macronutrientes em mudas de tomate para processamento industrial

Abstract

The objective of the study was to identify and describe the visual symptoms in seedlings of tomato processing, stemming from lack of macronutrients and evaluate biometric attributes that stage, as well as their nutritional status. The experiment was conducted in an agricultural greenhouse, in randomized complete block, with eight treatments and four replications. The treatments were: complete nutrient solution; solutions with individual omission of nutrients N, P, K, Ca, Mg and S; and solution only with deionized water. Held sowing in trays with substrates for later transplanting for phenolic foam. Nutritional solutions were applied daily. For 30 days of experiment was realized descriptive analysis and records of the evolution of nutritional deficiency symptoms. At 30 days after sowing, were obtained readings of the relative index of chlorophyll, height, stem diameter and the number of leaves of the seedlings of the hybrids (N901 and H9553) of industrial tomato and the aerial part of the seedlings were stored for the determination of dry matter. The omissions promoted morphological changes, characterized by visual symptoms of nutritional deficiency, with the omission of N, deionized water and Ca being the first to show signs of deficiency. The deficiencies of nutrients N and Ca were the most limiting for the development of industrial tomato seedlings. The lack of N and Mg were the most affected the IRC. The chlorophyll meter can be used to assess the nutritional status of seedlings of tomato industrial.