TITLE:
Diagnosis and Recommendation Integrated System (DRIS) to Assess the Nutritional State of Cotton Crop in Brazil
AUTHORS:
Ademar Pereira Serra, Marlene Estevão Marchetti, Simone Cândido Ensinas, Henrique Soares de Morais, Vanessa do Amaral Conrad, Franklyn Clawdy Nunes Guimarães, Gislaine Paola de Oliveira Barbosa
KEYWORDS:
Nutritional Diagnosis; Gossypium Hirsutum; Mineral Nutrition and NBI
JOURNAL NAME:
American Journal of Plant Sciences,
Vol.5 No.4,
February
26,
2014
ABSTRACT: The diagnosis of nutritional state is an important
tool to understand the nutritional requirement of plants and the influence of
the nutritional balance on the yield. The proposed in this study was to apply
the Diagnosis and Recommendation Integrated System (DRIS) to assess the
nutritional state of cotton crop through the order of nutrient requirement and
nutritional balance. Yield data from plots (average acreage 100 ha) and foliar
concentrations of macro and micronutrients of cotton (Gossypium hirsutum r. latifolium) plants were stored in a database.
The criterion to define the reference population consisted of plots with
above-average yields + 2/3 standard
deviation (over 4785 kg·ha-1 seed cotton yield). The DRIS method was
efficient to evaluate the nutrition state of cotton. It was feasible to
identify the order of plant requirement and nutritional balance. It was
feasible to observe that when minor the Nutritional Balance Index (NBI) it’s
higher the yield. It means that to reach high yield it is necessary to show low
NBI. The Sulphur, Boron and Zinc showed the higher frequency as the most
required nutrients by plant. The Magnesium and Manganese were the less required
by the cotton plant, this means that both of them were limiting the yield by
excess in the tissue.