Economical nitrogen dose for production of irrigated naturally colored cotton in the semi-arid region

Francilene De L Tartaglia,Allysson P Dos Santos,Manoel G Dos Santos,Lindomar M Da Silveira,Almir R E De Souza,Aurélio P Barros Júnior

doi:10.1590/1807-1929/agriambi.v24n11p783-789

Abstract

ABSTRACT Determining the economical dose of nitrogen (N) for colored cotton can increase yield and income of farmers. The experiment was carried out under field conditions at the Experimental Farm of the Universidade Federal Rural do Semi-Árido, in the years 2016 and 2017. The objective was to determine the economical N dose for four colored cotton cultivars. The experimental design was in randomized blocks, with split plots and four repetitions. Five N doses (0, 50, 100, 150 and 200 kg ha-1) were randomized in the main plots and four colored cotton cultivars (BRS Safira, BRS Rubi, BRS Topázio and BRS Verde) were randomized in the subplots. The characteristics evaluated were seed cotton yield, cotton fiber yield, N concentration in leaf tissue, technical dose and economical dose of N. Higher yield of naturally colored cotton can be obtained using the economical doses of 140 kg ha-1 N for cultivars BRS Rubi and BRS Verde, 150 kg ha-1 N for BRS Topázio and 160 kg ha-1 N for BRS Safira. Highest yield was achieved with the cultivar BRS Topázio and lowest with the cultivar BRS Verde.

Highlights

Cotton (Gossypium hirsutum L.) with naturally colored fiber is grown in the Brazilian semi-arid region
Higher yield of naturally colored cotton can be obtained using the economical doses of 140 kg ha-1 N for cultivars BRS Rubi and BRS Verde, 150 kg ha-1 N for BRS Topázio and 160 kg ha-1 N for BRS Safira
Highest yield was achieved with the cultivar BRS Topázio and lowest with the cultivar BRS Verde

Summary

Introduction

Cotton (Gossypium hirsutum L.) with naturally colored fiber is grown in the Brazilian semi-arid region. For the cultivars BRS Verde and BRS 200 Marrom, the maximum fiber yields were obtained at N doses of 240 and 300 kg ha-1, respectively (Lima et al, 2006; Alves et al, 2009). These studies, considered only the dose of physical efficiency (technical dose of N), disregarding the selling price of cotton and the cost of nitrogen fertilizer. In the form of KCl (58% K2O), was applied (130 kg ha-1 K2O in the 2016 and 2017 seasons) through irrigation water and split into four equal portions together with the nitrogen (N) doses (Pedroso Neto et al, 1999). The N doses used were: 0, 50, 100, 150 and 200 kg ha-1, in the form of urea (45% N) and supplied to plants by irrigation

Material and Methods

Conclusions

Findings

Literature Cited