Influência do boro no teor, acúmulo e eficiência nutricional em porta-enxertos de caramboleira

Abstract

RESUMOA capacidade de absorver, transportar e utilizar os nutrientes é diferente entre as plantas. Há poucos trabalhos na literatura a respeito da influência do boro (B) na eficiência nutricional de porta-enxertos de caramboleira. Diante da falta de informações, o trabalho teve por objetivo avaliar a influência do B sobre o teor, o acúmulo, a eficiência de absorção, de transporte e de uso de nutrientes em porta-enxertos de caramboleira. O delineamento utilizado foi em blocos casualizados, com cinco doses de B: zero; 1; 2; 3; e 4 mg dm -3 de B e quatro repetições. Aos 170 dias após a aplicação do B, as plantas foram coletadas, separadas em parte aérea e raízes, secas, pesadas, moídas e determinados os teores, calculados os acúmulos, a eficiência de absorção, de transporte e de utilização de macro e micronutrientes. Os teores de cálcio (Ca) e B nas raízes dos porta-enxertos diminuíram com o incremento de doses de B. Os resultados permitiram concluir que as doses mais elevadas de boro aumentaram a eficiência de transporte e utilização de Ca. Palavras-chave: absorção de nutrientes; Averrhoa carambola L.; macronutrientes Influence of boron on the content, accumulation and nutritional efficiency in rootstock of star fruitABSTRACT The ability to absorb, transport and use nutrients is different between plants. There are few studies in the literature about the influence of boron (B) on the nutritional efficiency in rootstocks of the star fruit. In view of the lack of information, the objective of this study was to evaluate the influence of B on the content, accumulation, efficiency of absorption, transport and nutrient use in rootstocks of the star fruit. The design was randomized blocks, with five doses of B: zero; 1; 2; 3; 4 mg dm -3 of B and four replicates. At 170 days after application of B, the plants were harvested, separated in aerial part and roots, dried, weighed, ground and determined the contents, calculated the accumulations, the efficiency of absorption, transportation and use of macro and micronutrients. The calcium (Ca) and B contents in the roots of the rootstocks decreased with increasing doses of B. The results showed that higher doses of boron increased the transport efficiency and Ca utilization.

Nutritional Efficiency and Morphophysiological Aspects With Growth in the ‘Okinawa Roxo’ Peach Rootstock

“…Transport efficiency is an indication of the ability of the plant to transport nutrients from the roots to the shoots and incorporate the absorbed nutrient into the biomass (Xavier & Natale, 2017). Under the conditions of the present study, the nutrient solutions of T1 (Sn1) and T2 (Sn2) were most suitable for the genetic potential of the 'Okinawa Roxo' plants, showing similar nutrient transport efficiency, greater than seen in the plants from T3 and T4 (Table 5).…”

Organic substrates and slow-realease fertilizing on nutrient accumulation and absorption efficiency of custard apple seedlings

“…Moreover, there may have been positive interaction between nutrients, allowing higher AEI with the increasing doses of the slow-release fertilizer. Xavier & Natale (2017) observed positive interaction between B and N in starfruit rootstocks, which showed higher N absorption efficiency with the increment in B doses.…”

Deficiências de micronutrientes no estado nutricional de fisalis

“…Com a omissão de micronutrientes não houve diferença significativa na absorção de Cu e B, e apresentaram as menores taxas de EA. Diversos fatores influenciam a absorção de nutrientes, como os estádios de desenvolvimento da cultura, a eficiência das raízes e a disponibilidade de nutrientes Natale, 2017).…”