TEMPORAL VARIABILITY OF PLUVIAL PRECIPITATION AND YIELD OF HERBACEOUS COTTON IN DIFFERENT SYSTEMS OF SOIL MANAGEMENT AND NITROGEN FERTILIZATION VARIABILIDADE TEMPORAL DA PRECIPITAÇÃO PLUVIOMÉTRICA E RENDIMENTO DO ALGODOEIRO HERBÁCEO EM DIFERENTES SISTEMAS DE MANEJO DE SOLO E DE ADUBAÇÃO NITROGENADA

Gilvaneide Alves de Azeredo, Ivandro de França da Silva, Albericio Pereira de Andrade, Antonio Clementino dos Santos
2007 Pesquisa Agropecuária Tropical  
<!-- @page { margin: 2cm } --> <p class="western" align="justify">In order to analyze the effects caused by rain temporal variability on development of herbaceous cotton as a function of nitrogen fertilization and soil management system, experiments were carried out during four years in Alagoinha, Paraíba State, Brazil (1995, 1996, 1997, and 1999). It was used the cultivar CNPA 7H sowed in bed pits and in beds covered with plastic under four rates of nitrogen (0 kg ha-1, 30 kg ha-1, 60 kg ha-1
more » ... nd 90 kg ha-1) in radomized blocks with three replications. Crop phenological stages, biomass accumulation, and yield and its components were analyzed. The annual rainfall average in the period was 1,028 mm with large variation in the total amount of precipitation among the years evaluated, and its distribution in each year. It is clearly obseved the rainy period from March through August. The vegetative and reproductive stages of the crop changed according to the rain distribution during the cottondevelopment phases. There was a large variation among soil management systems and nitrogen doses as a function of time.</p> <p class="western">KEY-WORDS: Gossypium hirsutum L.; fertilization; phenological stage; biomass.</p><!-- @page { margin: 2cm } --> <p class="western" align="justify">O objetivo desta pesquisa foi avaliar os efeitos da variabilidade temporal da precipitação pluvial sobre o desenvolvimento do algodoeiro herbáceo, em função da adubação nitrogenada e de sistemas de manejo do solo. Realizaram-se experimentos no município de Alagoinhas-PB, nos anos de 1995, 1996, 1997 e 1999. Utilizou-se a cultivar CNPA 7H, plantada em cova, em camalhão desnudo e em camalhão com plástico, sob quatro doses de nitrogênio (0 kg ha-1, 30 kg ha-1, 60 kg ha-1 e 90 kg ha-1). O delineamento experimental foi blocos casualizados com três repetições. Nos experimentos, avaliaram-se os estágios fenológicos da cultura, a acumulação e o rendimento de biomassa, bem como os seus componentes. Verific [...]
doi:10.5216/pat.v36i2.2148 doaj:b6069bc1c28541c0af3c959d6dee33f1 fatcat:jncxxw4bkngmfoa6fztdatzqni