Cultivo de melao organico: fosfatos naturais como fontes alternativas de fosforo.

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From: Revista Brasileira de Fruticultura(Vol. 31, Issue 2)
Publisher: Sociedade Brasileira de Fruticultura
Document Type: Article
Length: 4,010 words

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Abstract :

Com o objetivo de avaliar o efeito de fosfatos naturais no cultivo irrigado de melao organico, foram conduzidos dois ensaios em Petrolina--PE, sendo um em Argissolo Amarelo (PA) e outro num Argissolo Acinzentado (PAC). Foram avaliados os seguintes tratamentos: 1- testemunha (sem P); 2- 50 kg [ha.sup.-1] de [P.sub.2][O.sub.5] na forma de superfosfato triplo (ST); 3- 100 kg [ha.sup.-1] de [P.sub.2][O.sub.5] na forma de ST; 4- 150 kg [ha.sup.-1] de [P.sub.2][O.sub.5] na forma de ST; 5- 100 kg [ha.sup.-1] de [P.sub.2][O.sub.5] na forma de termofosfato; 6- 100 kg [ha.sup.-1] de [P.sub.2][O.sub.5] na forma de fosfato natural de Gafsa, e 7- 100 kg [ha.sup.-1] de [P.sub.2][O.sub.5] na forma de fosfato natural Fosbahia. O melao apresentou resposta semelhante as doses de P nos dois solos, cujas produtividades maximas de 26,00 t [ha.sup.-1] e 25,46 t [ha.sup.-1] foram obtidas com 107,6 kg [ha.sup.-1] e 118,6 kg [ha.sup.-1] de [P.sub.2][O.sub.5] no PA e PAC, respectivamente. A eficiencia do termofosfato, fosfato de Gafsa e Fosbahia em relacao ao ST assumiu a sequencia de 86,2%, 77,1% e 71,9% no PA e 101,5%, 72,3% e 67,3% no PAC, demonstrando que o termofosfato e a fonte de fosforo mais indicada para ser usada no cultivo organico do melao. Sao necessarios 843,12 kg de termofosfato para produzir 25.000 kg [ha.sup.-1] de melao, que representa 3,4% do custo de producao. Termos para indexacao: Cucumis melo, dose de fosforo, eficiencia de fosfato, fertilizacao, irrigacao, analise economica. Aiming to evaluate the efficiency of natural phosphates in melon organic cropping under irrigation, two experiments were carried out in Petrolina-PE, one in a Yellow Argisol (PA) and other in a Grey Argisol (PAC). The evaluated treatments were: 1-without P, 2-50 kg [ha.sup.-1] of [P.sub.2][O.sub.5] as triple super phosphate TS), 3-100 kg [ha.sup.-1] of [P.sub.2][O.sub.5] as TS, 4-150 kg [ha.sup.-1] of [P.sub.2][O.sub.5] as TS, 5-100 kg [ha.sup.-1] of [P.sub.2][O.sub.5] as thermo phosphate, 6-100 kg [ha.sup.-1] of [P.sub.2][O.sub.5] as natural phosphate of Gafsa and 7-100 kg [ha.sup.-1] of [P.sub.2][O.sub.5] as natural phosphate Fosbahia. The melon crop showed similar responses to the P application in both soils, whose maximum productivities of 26.00 t [ha.sup.-1] and 25.46 t [ha.sup.-1] were obtained with 107.6 kg [ha.sup.-1] and 118.6 kg [ha.sup.-1] of [P.sub.2][O.sub.5] in PA and PAC, respectively. The efficiency of thermo phosphate, phosphate of Gafsa and Fosbahia in relation to TS assumed the sequence of 86.2%, 77.1% and 71.9% in PA and 101.5%, 72.3% and 67.3% in PAC. These results suggest that thermo phosphate is the most appropriated phosphate source to be used in the melon organic cropping. It is necessary 843.12 kg of thermo phosphate to produce 25 t [ha.sup.-1] of melon fruit that represent 3.4% of the production cost. Index terms: Cucumis melo, phosphorus level, phosphate efficiency, fertilization, irrigation, economic analysis.

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Gale Document Number: GALE|A212210985