Adubação Nitrogenada E Potássica Em Goiabeiras ‘Paluma’:ii. Efeito No Estado Nutricional Das Plantas

Abstract

RESUmo -a adequada adubação mineral de pomares de goiabeira, sob manejo intensivo, é fator preponderante na produtividade, e o acompanhamento do estado nutricional das plantas contribui para a eficiência desta prática agronômica. Objetivou-se pesquisar o efeito de diferentes doses de nitrogênio e potássio sobre o estado nutricional de goiabeiras 'Paluma'. o experimento foi conduzido em Vista alegre do alto-SP, em pomar irrigado, com sete anos de idade, manejado com podas de frutificação, durante quatro ciclos de produção consecutivos. O solo é o Argissolo Vermelho-Amarelo distrófico. o delineamento experimental foi em blocos ao acaso, com três repetições, em esquema fatorial com quatro doses de nitrogênio (0; 0,5; 1,0 e 2,0 kg planta -1 de N) e quatro de potássio (0;0,55; 1,1 e 2,2 kg planta -1 de K 2 o). a adubação nitrogenada promoveu aumento nos teores foliares de n e Mn e decréscimo nos teores de P e B, observados do segundo ao quarto ciclo produtivo. a adubação nitrogenada elevou os teores de ca e Mg, respectivamente, no segundo e terceiro ciclos. com exceção do primeiro ciclo produtivo, os teores foliares de K e Mn aumentaram em função da adubação potássica, enquanto os teores de Mg, no segundo e quarto ciclos, diminuíram em função dessa adubação. Termos para indexação: Psidium guajava, análise foliar, macronutrientes, micronutrientes. NITRoGEN AND PoTASSIUm FERTILIZATIoN IN 'PALUmA' GUAVA TREES: II. EFFECT oN NUTRITIoNAL STATUS oF THE PLANTSABSTRACT -the proper mineral fertilization of guava orchards under intensive management, is a major factor in productivity and monitoring the nutritional status of the plants contributes to the efficiency of this agronomic practice. the aim of this study was to investigate different doses of nitrogen and potassium in the nutritional status of guava 'Paluma'. the experiment was conducted at Vista alegre do alto, São Paulo, in a 7 year old irrigated orchard, managed with fruiting pruning during four consecutive growing seasons. the soil is a dystrophic ultisol. the experimental design was randomized blocks, in factorial, with four nitrogen doses (0, 0.5, 1 and 2 kg of N plant -1 ) and four of potassium (0, 0.55, 1.1 and 2.2 kg of K 2 o plant -1 ), with three replications. nitrogen fertilization promoted increased levels of leaf n and Mn and the decrease in the levels of P and B; effects observed from the second to the fourth production cycle. Nitrogen fertilization increased the Ca and Mg levels, respectively, in the second and third cycle. Except for the first production cycle, K and Mn foliar concentrations increased with increasing potassium fertilization, whereas the levels of Mg, in the second and the fourth cycle, decreased as a function of fertilization.

Nutrient contents and fertirrigation in camu camu (Myrciaria dubia (Kunth) McVaugh) crop with different nitrogen doses

“…These results are comparable in variability to the report by Amorim et al (2015), who worked with mineral nutrition in guava (Psidium guajava L.) plants, where Ca concentrations in leaves increased with increasing N doses.…”

“…Therefore, accordingly to Amorim et al (2015), the leaf contents are not directly related to nutrient concentrations in soil, but rather implies an effect of the interaction with nitrogen fertilization. This may be related to the higher nitrogen uptake in relation to P, Mg and S or due to the dilution effect caused by a faster growth of fertilized camu-camu plants with higher N doses.…”

Evolution of the predictive criteria for the tropical fruit tree nutritional status

“…There were five trees per plot and the three central trees were monitored. Leaf nutrient concentration, soil fertility and fruit production were determined during three consecutive cycles (Amorim et al, 2015). Balances were designed to improve the understanding of N and K fertilizer effects on the soil using the sequential binary partition in Table 1 used to compute ilr coordinates.…”

Water salinity and nitrogen fertilization in the production and quality of guava fruits

“…Nitrogen (N) is the nutrient required in largest amount by most plants and the second most required by the guava crop in its initial development stage (FRANCO et al, 2007). A number of studies have been carried out with crops such as banana (MAIA et al, 2003), carambola (LEAL et al, 2007), guava (AMORIM et al, 2015) and castor bean (LIMA et al, 2015), and have shown beneficial effects of nitrogen application on plant growth and development. However, studies related to nitrogen application under salt stress conditions are scarce in guava, especially in the production phase.…”