INFLUÊNCIA DE DOSES DE NITROGÊNIO E FÓSFORO SOB A PRODUÇÃO DE MILHO VERDE

Corn is a crop and agricultural commodity of great prominence in the agricultural sector and can be produced for different purposes. One of its niche markets is the exploitation of its grains in the milky phase, aiming at serving the “in natura” market, being popularly known as green corn, representing a source of income, especially for family farmers in small and medium properties. Several factors influence the productivity of maize, among them the correct management of soil fertility, because the success of production necessarily requires the assertive use of fertilizer. From this perspective, the objective of this research was to evaluate the response of green corn crop to different doses of nitrogen and phosphorus in ear production. The experiment was conducted at Sítio Madeira Cortada, located in rural Missão Velha-CE. The soil of the experimental area is classified as typical Red Yellow Latosol. Two experiments were conducted simultaneously, aiming to verify the effect of nitrogen and phosphate fertilization individually. Both experiments followed the randomized block design with four treatments and six blocks, totaling 24 experimental plots each, consisting of four fertilizer doses (0, 25, 50 and 100% of the recommended dose). Each experimental plot consisted of four rows of maize spaced 0.9 meters, 4 meters long, and the useful plot consisted of the two central rows, each one meter long. Data were analyzed by analysis of variance (ANOVA) and F test and submitted to polynomial regression test. The program used to analyze the data was SISVARUFLA. The variables stem diameter, ear length did not differ significantly for nitrogen and phosphorus dosages, while ear diameter was significant at 5% in both nutrients. The variables ear mass number of ears per hectare, number of commercial ears per hectare. The nitrogen content of 100% (120 kg of N ha-1) resulted in the best results in ear production. Regarding phosphorus, the 50% dosage (50 kg P ha-1) was responsible for the generation of green ears in larger quantity and better quality