Cloreto de potássio revestido em efeito residual no feijoeiro de inverno irrigado na região de cerrado

Abstract

Resumo Com a finalidade de manter os nutrientes disponíveis para as plantas têm-se buscado fertilizantes de liberação controlada. Neste contexto, objetivou-se avaliar o efeito residual de doses de potássio usando cloreto de potássio e cloreto de potássio revestido por polímeros, aplicados na cultura do milho, nos componentes de produção e a produtividade do feijoeiro de inverno irrigado, cultivado em sucessão, em condições de cerrado. O experimento foi conduzido em Selvíria-MS, com coordenadas geográficas de 51 o 22 ‫׳‬ de longitude Oeste e 20 o 22 ‫׳‬ de latitude Sul, num Latossolo Vermelho distrófico de textura argilosa, em 2009 e 2010. O delineamento estatístico utilizado foi o de blocos casualizados, com quatro repetições, dispostos em um esquema fatorial 4 x 2, sendo: 4 doses de K 2 O (0, 40, 80 e 120 kg ha-1) e 2 fontes de potásio (KCl e KCl revestido por polímeros) aplicadas na semeadura do milho. O KCl revestido por polímeros teve o mesmo efeito residual que KCl convencional, pois proporcionou resultados semelhantes para os teores foliares de K e de clorofila, nos componentes de produção e na produtividade de grãos de feijão de inverno irrigado. O incremento das doses de potássio na cultura anterior (milho) porporcionou efeito residual, pois influenciou positivamente o número de grãos por planta em 2009 e aumentou linearmente o teor de clorofila e a produtividade de grãos de feijão de inverno irrigado em 2010, independentemente da fonte de K. Palavras-chave: Phaseolus vulgaris, adubação potássica, feijão, fertilizante revestido, doses de potássio, sistema plantio direto Abstract In order to maintain the nutrients available to plants have been studied controlled release fertilizers. In this context, the objective was to evaluate the residual effect of doses of potassium chloride, coated or not, applied in the corn crop, regarding the crop components and grains yield of irrigated winter common bean, cultivated in followed, in Cerrado region. The experiment was conducted in Selvíria-MS, Brazil, 51°22' west longitude and 20°22' south latitude, in a clayey Oxisol, in 2009 and 2010. A randomized block design with four repetitions was used, disposed in a factorial scheme 4 x 2, being: four K 2 O doses (0, 40, 80 and 120 kg ha-1) and two potassium sources (potassium chloride and coated potassium chloride by polymers) applied at sowing in the corn crop. The coated potassium chloride by 1 Discente(s) em

Residual Effects of Nitrogen Fertilizer With Polymer-Coated Urea in a Corn Crop

“…Therefore, it is likely that the coating was The effectiveness of a coated fertilizer depends on the solubility of the polymer-coated granule and the rate of hydrolysis, which regulates the nutrient supply process. The release rates and dissolution of water-soluble fertilizers depends on the coating materials that are used (RODRIGUES et al, 2013). Yet, according to these authors, nutrient release will also depend on the temperature and soil moisture.…”

Phosphorus and potassium fertilization increase common bean grain yield in Mozambique

“…However, 100-grain weight was not affected by P or K doses in our trial, likely because the content of these nutrients in the soil (Table 1) (2011) and Nascente & Cobucci (2015) found no significant differences in the number of grains per pod or 100-grain weight with increasing levels of P in the soil. Rodrigues et al (2013) also did not report differences in the number of grains per plant with the increasing K levels. Thus, it can be inferred A.…”

Doses of Phosphorus in Monoammonium Phosphate form Incorporated in Biodegradable Polymers for Corn

“…The effectiveness of the coated fertilizers depends on the solubility of the polymer coating the granule and the hydrolysis, which will regulate the nutrient supply process (Mello et al, 2017). These rates of release and dissolution of water-soluble fertilizers depend on the coating materials (Rodrigues et al, 2013). According to these authors, the nutrient release will depend on soil temperature and humidity, which in the present case presented high temperatures and low precipitation, as shown in Figure 1.…”