EXIGÊNCIAS NUTRICIONAIS DE MUDAS DE<i> Dipteryx alata</i> SOB LIMITAÇÃO NUTRICIONAL

Abstract

RESUMOObjetivou-se, neste estudo, avaliar os requerimentos nutricionais e o efeito da limitação de nutrientes no desenvolvimento de mudas de baru (Dipteryx alata Vogel) utilizando a técnica da limitação nutricional. O ensaio foi estabelecido em delineamento inteiramente casualizado com 12 tratamentos e oito repetições. Os tratamentos adotados foram os seguintes: completo 1 (C1 -adubado com N, P, K, S, B, Cu, Zn e calagem), completo 2 (C2 -adubado com N, P, K, S, Ca, Mg, B, Cu, Zn, sem calagem), tratamentos completos com omissão de um nutriente por vez (completo 1 -N, completo 1 -P, completo 1 -K, completo 1 -S, completo 1 -B, completo 1 -Zn, completo 2 -Ca, completo 2 -Mg, completo 1 -calagem) e controle (solo natural). Aferiu-se o diâmetro e a altura das plantas, separando-as em parte aérea e sistema radicular. As mudas foram secas, pesadas, moídas e foi determinado o teor de nutrientes na matéria seca da parte aérea. De acordo com os resultados, as limitações de S e B não afetaram o crescimento das mudas de Dipteryx alata. P e N foram, de forma geral, os nutrientes que mais limitaram o crescimento das mudas de baru. A sequência de exigência nutricional apresentada pelas mudas de baru, considerando a produção de biomassa seca da parte aérea, em ordem decrescente foi: P = N > Ca = Mg = Zn = K = S = B. Palavras-chave: nutriente faltante; Fabaceae-Faboideae; Cerrado; adubação mineral. ABSTRACTThis study was conducted with the objective of evaluating the nutritional requirements and the effect of nutrient limitation over the development of baru seedlings (Dipteryx alata Vogel), using the nutrient limitation technique. The trial was established in a completely randomized design, with 12 treatments and 8 replicates. The adopted treatments were the following: complete 1 (C1 -fertilization with N, P, K, S, B, Cu, Zn and liming), complete 2 (C2 -fertilization with N, P, K, S, Ca, Mg, B, Cu, Zn, with no liming), complete treatment with the omission of a nutrient at a time (C1-N, C1-P, C1-K, C1-S, C1-B, C1-Zn, C2-Ca, C2-Mg, C1-liming) and control (natural soil). We assessed plant height and diameter, and separated them into shoot and root system. The seedlings were dried, weighed, ground for the determination of nutrient content of the shoot dry matter. According to the results, the limitation of S and B did not affect the growth of Dipteryx alata seedlings. In general, P and N were the nutrients that most limited the growth of Baru seedlings. The 1 Engenheiro Agrônomo, Dr., Professor da Universidade do Estado de Minas Gerais, Av. Paraná, 3001, JardimBelvedere, CEP 35501-170, Divinópolis (MG), Brasil.

Phosphate and nitrogen fertilization in the production of Barueiro (Dipteryx alata Vog.) seedlings

“…Tamarind (Tamarindus indica L.) seedlings fertilized with P (10,000 mg P 2 O 5 dm -3 substrate), when N is applied (800 mg dm -3 substrate) showed higher growth, and the combined application of both nutrients is recommended to obtain the largest average length of seedlings of this species (SOUZA et al, 2007). In another study, nitrogen and phosphorus were the nutrients that most affected the growth of barueiro seedlings under nutritional limitations, demonstrating their importance for plant development (SOUSA et al, 2018).…”

Determination of Optimal Nutrient Levels in Baru Seedlings (Dipterix alata Vog.) Using the Mathematical Chance Method

“…Boni et al (2016) reported N content values in baru seedlings of 26.4 g per kg, which falls within this range. While evaluating Baru's nutritional status, Souza et al (2018) found that suitable N levels for seedling development ranged from 20.20 to 26.00 g per kg.…”

Ecophysiology, quality, and mycorrhizal dependency in Musa spp. (cv. Grand naine) seedlings

“…A study with Dioscorea alata L. addressed the specific requirement of P and N (nitrogen) for biomass accumulation (SOUSA et al, 2018), with increasing linear QDI responses to different P doses, especially when accompanied by nitrogen fertilization (PINHO et al, 2019). Research shows that inoculation with AMF improve the uptake and ratio of N and P in plants, directly influencing their growth (AUGÉ et al, 2016;KANDHASAMY et al, 2020).…”