Nitrogen fertilization in narrow row cotton productivity in second harvest

Abstract

The narrow row cotton grown in the second harvest is presented as an alternative in order to reduce cost of production due to lower cycle. However, nitrogen fertilization in this growing season is little studied. The objective was to evaluate the effect of nitrogen in narrow row cotton crop, grown in second harvest after bean. The experiments were set in a randomized block design with 4 treatments and 5 repetitions in the agricultural years 2009/10 and 2010/11. The treatments consisted of nitrogen application in coverage broad­casted in the form of urea at rates of 60, 80, 100 and 120 kg ha^-1 N in two years of cultivation. It was con­cluded that the nitrogen rate of approximately 85 kg ha^-1 applied in coverage in narrow row cotton, grown in second season, increases the number of bolls per plant, boll mass and cotton yield productivity.

Additional keywords: calibration curve, yield; cultural practices; Gossypium hirsutum L.; Savanna.