Eng. Agron., MS., Doutorando em Agronomia (Produção Vegetal) pelo convênio DINTER entre a UNESP/Jaboticabal-SP e a UFPI/ Teresina-PI. E-mail: fluisga@yahoo.com.br 3 Eng. Agron, Dr., Professor Adjunto do Departamento de Tecnologia da FCAV/UNESP, Jaboticabal. Via de acesso Prof. Paulo Donato Castellane, s/n, 14.884-900, Jaboticabal-SP. E-mail: cazetta@fcav.unesp.br 4 Eng. Agron., MS., Doutoranda em Agronomia (Ciência do Solo), FCAV/UNESP, Jaboticabal-SP. E-mail: teferxa@hotmail.com ADUBAÇÃO FOSFATADA NO MELOEIRO-AMARELO: REFLEXOS NA PRODUÇÃO E QUALIDADE DOS FRUTOS 1 FRANCISCO LUIS GONÇALVES DE ABRÊU 2 , JAIRO OSVALDO CAZETTA 3 , TEREZINHA FERREIRA XAVIER 4 RESUMO -O melão (Cucumis melo L.) é uma das culturas de grande expressão econômica e social para a região Nordeste do Brasil. Apesar disso e dos baixos níveis de fósforo (P) dos solos tropicais, existem poucas pesquisas sobre adubação com P nesta cultura, embora seja frequentemente mencionado que este nutriente tem papel preponderante na produção e qualidade dos frutos. Neste contexto, objetivou-se com este trabalho avaliar o efeito de doses de P (0; 120; 240; 360 e 480 kg ha -1 de P 2 O 5 ), na produção e qualidade do melão-amarelo híbrido Goldex F 1 , nas condições ambientais de Teresina -Piauí. O experimento foi conduzido em um delineamento de blocos ao acaso, com quatro repetições, tendo 40 plantas por parcela. Os frutos foram colhidos aos 75 após o plantio. Foram avaliados os dados médios da produção total, produção de frutos comerciais, massa e número de frutos por planta, comprimento e diâmetro de frutos, espessura da polpa de frutos, sólidos solúveis, acidez titulável e o índice de maturação. A produção total e comercial, assim como a massa e o número de frutos e acidez titulável aumentaram com as doses de P aplicadas até a dose de 278 kg ha PHOSPHORUS FERTILIZATION ON MELON: REFLEXES ON FRUITS PRODUCTION AND QUALITYABSTRACT -The culture of melon (Cucumis melo L.) has a great economic and social expression for the Northeast region of Brazil. Although its importance in the Brazilian agriculture, and the low levels of phosphorus (P) on tropical soils, there are reduced number of researches regarding P fertilization for this culture, even though is frequently mentioned that this nutrient would have preponderant rules on the development, growth and quality of the fruits. Thus, the objective of this study was to evaluate the effect of P doses on the production and quality of yellow cantaloupes, hybrid Goldex F1, growing under Teresina-PI conditions. The experiment was composed by 5 P doses (0, 120, 240, 360 and 480 kg ha -1 of P 2 O 5 ), carried out in four randomized blocks design. The fruits were harvested at 75 days after planting, and evaluated the total production; production of commercial fruits; mass and number of fruits per plant; length and diameter of fruits; pulp thickness, soluble solids, acidity and maturation index. The results indicated that the total and commercial production, mass and number of fruits as well as acidity increas...
Sistema radicular de três porta-enxertos para lima ácida 'tahiti' no estado do Piauí Semina: Ciências Agrárias, Londrina, v. 28, n. A wooden frame divided into 0.1 x 0.2 m parts was fixed in the soil profile and a digital photograph was taken from each part. These photographs were analyzed by software SIARCS 3.0 for sizing of the root system and the data gotten, submitted to the analysis of variance with Tukey test at the level of 5% of probability. The experimental design was entirely randomized, with three treatments (rootstocks) and four replications (trenches). The root systems of the rootstocks had 90% of concentration until the depth of 0,4 m, and it was observed that 60% of the roots were concentrated in the first 0,2 m. The root system of the Rangpur lime demonstrated to be superior, in lenght (cm.200 cm -²) to the Flying Dragon trifoliate and Swingle citrumelo root systems.
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