Qualidade de aplicação de inseticidas no algodoeiro ultra-adensado, adensado e convencional

Abstract

The cotton crop is economical important crop where is cultivated and it is one of responsible to maintain Fieldwork in the field. Instead its adaptation to Cerrado condition it is host of complex pests that can cause damage to root, stalk, leaf, flower buttons, flowers and bolls. The phytosanitary treatment effectiveness depends of the how much drop is deposited under the vegetation and the uniformity of the target coverage and the way of the drop is deposited. The main objective of this work was to evaluate what it is the best angle of spray displacement of insecticides in relationship of cultivated cotton crop row cultivated in the ultra-narrow, narrow and conventional spacing between rows. The work was developed in the Experimental Farm of the “Universidade Federal da Grande Dourados”, in 2011/2012 harvest year. The experiment was installed in split-split-plot scheme with 4 replication, with 3 system of cotton spacing between rows and 4 angle of spray displacement of insecticides in relationship to cultivated cotton crop row. The variable analyzed were cotton aphid and cotton leaf worm control and the quality of the drop deposited. The dates were submitted through variance analyze (p<0,05), and compared with the Tukey medium test in 5% of probability. The angle of spray displacement of insecticides in relationship of cultivated cotton crop row influenced the quality of application to cotton leaf worm and cotton aphid control. It was significative interaction between row spacing and angle of spray displacement of insecticides in relationship of cultivated. The amount of drop deposition, drop densities and drop coverage occurred mainly in the upper plants section in all the treatments system of cotton spacing between rows. The angle of spray displacement of insecticides in relationship to cultivated cotton crop of 30° it was that cause the most reduction of cotton leaf worm in the treatments system of cotton spacing between rows of 0,45 e 0,90 m in all the evaluation. The angle that causes the most reduced population of small cotton leaf worm was 45°. The most opening between rows before spray occurred in the 0,90 m spacing rows cultivated and cause the most numbers of drops, drops coverage, drops density in the bottom plant section. The cotton plant height it was influenced by the 0,22 m spacing between rows. The angle of spray displacement of insecticides in relationship to cultivated cotton crop row of 0° cause the most number of plants crushed in the 0,22 m and the minor in the 0,90 m spacing between rows. The cotton crop yield seed it was bigger in the 0,22 m spacing between rows.