Levels organic fertilization of lettuce cultivar for using irrigation system located by gravity

The cultivation of vegetables shows in the Northeast impossible without the practice of irrigation. This study aims to evaluate the development of lettuce, varying the organic manure at various rates of manure and ash, using drip irrigation drip-type microtubules, and issuers rated in accordance with the pressure at the beginning of them. The experiment was conducted in FATEC Sobral with eight treatments varying the amount of cattle manure and ash, with five replicates. The experimental design was completely randomized in a factorial 5 x 8. Stem diameter and stem length, fresh weight and dry. The data were subjected to analysis of variance and when significant by F test, were submitted to regression analysis. For treatments where there was only a variation of the amount of manure added, there was a better outcome with regard to the development of lettuce for the largest amounts of additives. The length and stem diameter varied significantly in relation to different amounts of fertilizer with manure, manure with and without ash and the interaction between manure and ashes. Fertilization with the addition of ash proved to be unfavorable to the development of lettuce in relation to the amount of ash used in the experiment, the pH increased significantly and may have hampered the availability of some nutrients for the plant, causing your bad development . The system showed good uniformity can be indicated as a good option to conventional practices of irrigation and an alternative that has a low cost.