Thermal requirements and agrometeorological modeling of cotton growth under soil fertility levels - DOI: 10.7127/rbai.v1601257

Artur Sousa Silva, Gabriel Siqueira Tavares Fernandes, Edivania de Araujo Lima, Kyvia Corrêa Nolêto, Victor Gurgel Pessoa, Arão de Moura Neto

Resumo


The objective was to quantify the thermal requirements and model the growth of cotton as a function of air temperature and degree-days, under levels of soil saturation and potassium fertilization, grown in a protected environment, in Bom Jesus, Piauí. The experimental design used was a completely randomized design (DIC) with a 3 X 3 + Witness factorial scheme, consisting of three levels of base saturation (V%) (50%, 60% and 70%) and three concentrations of potassium fertilization doses (50% below recommended; recommended, according to soil analysis; 50% above recommended) and Control, without K application, with four replications. Plant height, stem diameter, number of nodes, midrib length and leaf area were evaluated. The meteorological data were obtained in a portable meteorological station, installed inside the protected environment. Among the stages, the First Boll-Harvestpresented the highest thermal demand, with an average of 551.7 °gd and 34 days of duration, followed by the Emergence-First Floral Bud (435.6 °gd), First Floral Bud- First Flower (362.5 °gd) and First Flower-First Boll (300.3 °gd), the Sowing-Emergence phase obtained 51.4 °gd. Air temperature is the meteorological element with the greatest impact on cotton development.


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Revista Brasileira de Agricultura Irrigada - RBAI

ISSN: 1982-7679

E-mail: revista@inovagri.org.br