Abstract
ABSTRACT Studies on plant nutrition are essential for a correct fertilizer management, improving yield and quality of the product, and it also may contribute for an updating recommendation. The aim of this study was to evaluate growth, nutrient accumulation and export, thermal sum and yield of zucchini cultivar Corona F1. The experiment was carried out from August 8 to October 25, 2013, in Santo Antônio de Posse, São Paulo State. At the end of the research, 84 days after transplanting (DAT), we observed 95 cm average height with 36 leaves and 45.8 t ha-1 maximum yield. The nutrient accumulation, in g plant-1, was: N (14.2) > K (9.3) > Ca (8.0) > Mg (2.5) > S (1.2) > P (0.9) and in mg plant-1, Mn (49.3) > Fe (34.9) > Zn (19.6) > B (16.4) > Cu (2.1) and export, in kg ha-1, was N (94.9) > K (44.1) > Ca (43.0) > Mg (12.6) > S (6.3 ) > P (5.3), in g ha-1, Mn (271.0) > Fe (159.2) > Zn (105.6) > B (82.8) > Cu (11.9). The highest nutrient demand occurred between 40 and 50 DAT. Cultivar Corona F1 cycle was completed within 1.538 degree-days.
Highlights
More studies on this crop are necessary, since nutritional misbalance, both because of lack or excess of nutrients, is a stressing factor for the plant (Furlani & Purquerio, 2010) and it influences directly on production and final quality of product
For cultivar Corona F1, the authors observed yield of 45.8 t ha-1, value close to 40 t ha-1 observed by Araújo et al (2001) for caserta type Novita (76 days after transplanting (DAT))
Results for yield of Italian zucchini verified in literature are very variable (29.9 to 71.4 t ha-1) (Strassburger et al, 2011b; Pôrto et al, 2012; Araújo et al, 2013; Costa et al, 2015) as function of growing period and harvest, since zucchini always is harvested unripe
Summary
More studies on this crop are necessary, since nutritional misbalance, both because of lack or excess of nutrients, is a stressing factor for the plant (Furlani & Purquerio, 2010) and it influences directly on production and final quality of product. Data on accumulation and extraction of nutrients for new hybrids are essential to help refine existing fertilizer recommendations. The use of methods for calculating thermal sum or degree days (GD) is based on premise that a plant needs a certain amount of energy to complete a given phenological phase or total cycle. These data allow to estimate the growing cycle duration and avoid periods in which the environment temperature may be limiting (Morais et al, 2010). The aim of this study was to evaluate growth, nutrient accumulation and export, thermal sum and yield of Italian zucchini, cultivar Corona F1, grown during winter/spring
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