Doses and frequencies of nitrogen and potassium application through fertirrigation in tomato plants

Author(s)

Gláucia Regina Anti

• Document type: Master's Dissertation
• Press: Piracicaba.
• Institution: Universidade de São Paulo (USP). Escola Superior de Agricultura Luiz de Queiroz (ESALA/BC)
• Defense date: 2000-10-30
• Advisor: Quirino Augusto de Camargo Carmello

Abstract

ln Brazil, the tomato is the vegetable with the largest value and volume of production, and it has the second harvested area. As it is a so important crop, it is necessary to know the factors which contributes for its high yield, as the adequate water and fertilization management. To evaluate the effect of nitrogen and potassium dose applied by fertirrigation and the frequency of application, an experiment in field was carried out in the experimental area of the Rural Engineering Department, in the Areão Farm, which belongs to the ?Luiz de Queiroz? College of Agronomy (ESALQ), University of São Paulo (USP). The randomized design was made up of three nitrogen doses (155, 310 and 465 kg ha<sup><small>-1</sup></small>), three potassium doses (190, 380 and 570 kg ha<sup><small>-1</sup></small>) and two frequencies of application (3 and 7 days). It was used the cultivar Carmem. The more efficient application frequency was at each 7 days, which gave the better fertirrigation management. However, the tomato production was very small, 8750 kg ha<sup><small>-1</sup></small>, under this condition, and the nutrient concentration in the diagnostic leaves showed deficient or near of this condition. The nutrient extraction by fruits was low too, the macronutrients extraction order was: nitrogen > potassium > phosphorus > magnesium > sulphur > calcium, and for micronutrients extraction was found: zinc > iron > copper > manganese > boron. (AU)