Different levels of irrigation and doses of potassium nitrate, apllied way fertilization on the culture of the formosa papaya
The present work had as objective evaluates the effect of different levels irrigation and of the application of the increasing quantity of potassium fertilization. Thefertilizer used was the potassium nitrate. Crop studied was papaya, group Formosa, variety Tainung Nº 1. Research was carried at the Distrito de Irrigação Jaguaribe Apodi (DIJA), located in Limoeiro do Norte, Ceará, Brazil. In both experiments, the crop was irrigated with a drip irrigation system. Each plant had three emitters withoutflow standard of 4 L h-1 and pressure of service of 10 m. Analyzed attributes were: diameter of the stem, length of fruit, average weight of the fruit, number of fruits perplant, productivity and total soluble solids levels in the fruit. In the first experiment, that deals with the irrigation depths, were applied five irrigation levels correspondent to 50, 75, 100, 125 and 150% of the Class A Pan evaporation. A randomized block design with three repetitions and five treatments was used. The results demonstrate that the utilization of greater irrigation depths increases the number of fruits per plant and productivity. However, it does not modify the diameter of the stem, length of fruit, and total soluble solids levels in the fruit. In the second experiment, referring to thepotassium fertilization, the treatments had consisted of the application of four different amounts of potassium nitrate. A randomized block design, with three repetition and four treatments was used. At the end of the experiment 69, 137, 172 and 206 kg KNO3 ha-1 month-1 had been applied according to the four treatments. The use for the producer of bigger dosages of potassium nitrate increases thenumber of fruits for plant, the average weight of the fruits and the productivity until a certain boundary-value, from which the value of these variable starts to decrease.The application of bigger doses of the fertilizer increases the average length of the fruit. However, it does not modify the total levels soluble solids in the fruit.
Advisor:Francisco Marcus Lima Bezerra; Thales Vinícius de Araújo Viana; Carlos Wagner Oliveira
School:Universidade Federal do Ceará
Source Type:Master's Thesis
Keywords:ciencias agrarias carica papaya l manejo de irrigação tanque classe ?a? kno3 produtividade irrigation management pan class fertirrigation productivity
Date of Publication:10/21/2006