Cabbage cultivars currently cultivated present high yield potential and may present differences regarding absorption and use of nutrients. Thus, studies quantifying plant growth and nutrient accumulation are the basis to improve fertilization efficiency and optimize yield. This study aimed to determine the dry matter and nutrient (N, P, K, Ca, Mg, S, Cu, Fe, Mn, and Zn) accumulation curve of cabbage cultivars during two growing seasons. Cultivars Astrus Plus and Green Valley were cultivated during summer-autumn crop season, while Astrus Plus and Fênix during the autumn-winter crop season. Plants were sampled after transplanting at 10-day intervals until harvest. Dry matter and nutrient accumulations are variable with growing season and cultivar. The highest dry matter and nutrient accumulation rates occur in the last ten days of the cycle. Fertilizations with N, P, K, Fe, and Zn should receive more attention due to higher harvest indices.
Bioensaio Sulfonilureia Plantas teste KEYWORDS Bioassay Sulphonylurea Test plants RESUMO: A seleção de espécies bioindicadoras do ethoxysulfuron pode viabilizar o estudo do comportamento deste herbicida no solo pela técnica de bioensaio, constituindo assim o objetivo deste trabalho. Utilizou-se o delineamento inteiramente casualizado, com quatro repetições, em que quatro espécies vegetais (sorgo, pepino, beterraba e tomate) foram cultivadas em solo submetido à aplicação de seis doses de ethoxysulfuron (0; 18,75; 37,5; 75; 112,5 e 150 g ha-1). Avaliou-se a fitointoxicação, altura de plantas (ALT) e matéria seca da parte aérea (MSPA), da raiz (MSR) e total (MST). Foram observados diferentes níveis de tolerância das espécies ao herbicida: o aumento das doses de ethoxysulfuron reduziu as variáveis ALT, MSPA, MSR e MST e aumentou a fitointoxicação para pepino, beterraba e tomate. O sorgo apresentou baixa sensibilidade ao herbicida. As maiores doses avaliadas inibiram o crescimento em altura e o acúmulo de matéria seca do pepino. A beterraba se comportou como espécie extremamente sensível, com redução de 100% em ALT e matéria seca a partir da segunda menor dose (37,5 g ha-1). Entre as espécies avaliadas, o pepino apresenta maior potencial para uso como bioindicadora em estudos com ethoxysulfuron.
Growth measurements such as leaf area (LA) and dry matter (DM) are important in experiments about plants population, fertilization, irrigation and others parameters of cultivation, in garlic crop. The LA and DM are commonly defined as destructive, lengthy and cause loss of plants in the experimental units. The objective of this study was to fit mathematical models using linear models that estimate the leaf area and dry matter of garlic plants - variety Ito. For that, garlic plants were collected at 30, 45, 60, 75, 90, 115 and 120 days after planting. The measurements of width (W), length (L) of leaves, LA, DM, pseudostem diameter (PD), number of leaves per plant (NL) and height (H) were determined in each time. The models were fitted to estimate the LA or DM as function of the variables W, L, L*W, PD and LA. The statistical analysis of the linear regression, coefficient of determination of the linear regression (R2), root mean square error (RMSE), modified concordance index (d1) and the BIAS index were verified to determine the most representative models. It`s possible to estimate the LA and the leaf DM of garlic plants using the variables: length, width, pseudostem diameter and height of plants.
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