Arabica coffee response to rates of coated and conventional urea in sandy soil

Abstract

The objective of this work was to evaluate the growth, relative chlorophyll index and nitrogen concentrations in leaves, and the grain yield of arabica coffee (Coffea arabica) fertilized with rates of N as coated and conventional urea, in a sandy soil under rainfed conditions. The experiment was carried out over three crop years, using 'Mundo Novo IAC 388-17-1' coffee, in a randomized complete block design, in a 3×2+1 factorial arrangement, with three treatments with 150, 300, and 600 kg ha-1 N, as coated and conventional urea, and a control without N, with six replicates. Nitrogen increased stem diameter, plant height, N concentrations and relative chlorophyll index in the leaves, as well as grain yield. Over the three crop years, the highest N rate provided the greatest grain yield. Coated urea has no advantage over the conventional one, in supplying N to arabica coffee crop, in sandy soil under rainfed conditions.

Soil chemical properties and nutrition of conilon coffee fertilized with molybdenum and nitrogen

“…This statement can be supported by assessing the N levels in January 2019 and 2020 and the productivity of Conilon coffee in the agricultural years 2018/2019 and 2019/2020 (Figure 6b), where lower N levels are found in the second year due to the higher productivity of the coffee crop. These results corroborate those obtained by Abranches et al (2019) when studying levels of nutrients in leaves of Arabica coffee, submitted to nitrogen fertilization. The authors observed in the first year a reduction in the levels of total N in coffee leaves during grain formation, with lower levels of N in March compared to values obtained in October.…”

Mulching de polietileno e fontes de adubo em cafeeiros: efeitos no teor de clorofila, produtividade e qualidade de bebida

“…Verificou-se efeito significativo dos tratamentos para clorofila total ao nível 1% de probabilidade pelo Teste F. Com base na intensidade da coloração verde das folhas, é possível estimar o índice relativo da clorofila na folha (IRCs), o qual se correlaciona aos níveis de N na folha de diversas culturas, como cebola (Kurtz et al, 2022), alface (Palavicini et al, 2021) e cafeeiro (Godoy et al, 2008;Abranches et al, 2019).…”

Volatilization of ammonia from conventional sources of nitrogen and compacted urea under controlled conditions

“…In light of the foregoing challenging agriculture scenario, several natural or synthetic compounds have been developed in order to minimize the nutrients loss when applied to the soil, be either by reducing the volatilization, leaching or the complexation with other ions (Guelfi, 2017). Among these technologies, using coating in fertilizers has been an alternative that has increased the fertilization efficiency, resulting in higher yields in different crops such as coffee (Abranches, 2019) and maize (Zavaschi et al, 2014). Among the used natural polymers are starch, algins, wheat gluten, rubber and latex (Guelfi, 2017).…”