PODA E ADUBAÇÃO VERDE SOBRE A NUTRIÇÃO DA TANGERINEIRA ‘Dancy’ (Citrus tangerina Hort. ex Tanaka)

Abstract

The Paraíba citrus orchards are handled without the worry of using agronomic techniques, which impacts on production. However, it can add low-cost technologies in the region in order to improve the quality of the fruits of these orchards. Thus, this study aimed to evaluate the efficiency of green manure associated different types of pruning orchard tangerine 'Dancy' (Citrus tangerine Hort. Ex Tanaka). The study was conducted at the site Boa Vista, in the municipality of Lagoa Seca, PB between the months of February 2011 through August 2012. The trial was distributed design in randomized blocks in split plot in time in the plot are green manures in the subplot pruning and the sub subplots planting dates of green manures, distributed in a factorial scheme (5 x 3) + 2, with the factors consisted of five types of green manures: velvet bean (MP - Mucuna aterrima) , jack bean (FP - Canavalia ensiformis L.), pigeon pea (FG - Cajanus cajan L.), sunn hemp (C - Crotalaria juncea L.) and weed management (EE - witness), three types of pruning, which were: canopy opening pruning (PA) and cleaning pruning (PL) and plants without pruning (PSP) and two growing seasons of green manures, and the third time and the time 4. We evaluated the levels of NPK in citrus leaves and green manures and the correlation between them. The data were submitted to ANOVA and significant variables was applied mean test. Canonical Correlation applied to the canonical pairs N, P and K, determined in green manure and leaves of tangerine 'Dancy' in order to associate the interactions of these variables in the treatments. For the analyzes used the SAS statistical software. The accumulation of N and K in legumes were not statistically affected by the factors studied under rainfed conditions . In the fourth growing season of green manures the weeds showed higher statistical results to other treatments for P. accumulation pruning cleaning is recommended for culture tangerine ' Dancy '. The tangerine showed a significant difference to the K content in different times of the experiment . In the match rainfed conditions was the nutrient that showed significant canonical correlation , indicating that as they increased the P content in green manures happened increase of this element in the culture of tangerine ' Dancy ' .