The use of fertigation as a means of supplying the nutritional needs of crops is a technique widely used among producers. However, it is necessary to improve this technique due, mainly, to the risks of contamination of natural resources. Thus, the objective was to study the productivity and leaf contents of melon nutrients and soil fertility, which presents a high concentration of potassium, when fertigated with doses of nitrogen and potassium in the irrigation water. Five treatments were arranged in randomized blocks with six repetitions. Treatments consisted of combinations of concentrations, in mg L-1, of nitrogen (N) and potassium (K) applied in irrigation water (0-0), (50-0), (50-54), (0-54) and (100-108). The leaf concentrations of nutrients of melon were evaluated at 35 days after planting, and fruit yield and soil fertility at harvest time. The melon cultivated in soil with a high level of K and basal application of 18 kg ha-1 of N in the foundation did not increase production, when fertirrigated with nitrogen and potassium. Although the contents of K, Fe and B varied between the doses of N and K applied, the plants did not have nutritional deficiency. Fertilizer applications in increasing doses contribute to the accumulation of salts in the soil, increasing the risk of salinization.
The onion (Allium cepa L.) is the third most cultivated vegetable and has great socioeconomic importance worldwide. Because it is highly perishable and has greater demand than supply, many post-harvest losses occur, most of them caused by inadequate storage conditions affecting the bulbs quality. This study aimed to evaluate the postharvest quality of onion as a function of fertilization with micronutrients, using the cultivar “Rio das antas”. The experiment was divided into two stages: field and laboratory. In the field, an experiment was installed between June and December 2019 at Experimental Farm Rafael Fernandes, in completely randomized blocks with nine treatments and four replications. The treatments consisted of the combined doses of B, Cu and Zn. In the laboratory, the experimental design was in completely randomized blocks in 9 x 4 split-plot design, with four replications. The treatments (micronutrients B, Cu and Zn) were arranged in the plots and the storage times were arranged in the subplots (0; 20; 40 and 60 days after harvest). Bulb firmness, soluble solids (ºBrix), total soluble sugars and pungency were evaluated. The data were subjected to statistical analysis as a function of storage time, by the Sisvar program, applying regression analysis. The combined application of doses of 1-4-1 kg.ha-1 of Boron, Copper and Zinc, respectively, presented the best results for pungency, firmness and sugars during storage, this being the most recommended treatment for not significantly different from higher doses, promoting more efficient use of inputs.
RESUMO:O objetivo desse trabalho foi avaliar a absorção de nutrientes pelo mamoeiro em função das épocas de cultivo. As plantas foram coletas em pomares comerciais localizados no município de Baraúna-RN. O delineamento experimental foi o inteiramente casualizado (DIC) com cinco tratamentos que corresponderam a dias após o transplantio (87, 145, 176, 236, 285 DAT) e quatro repetições. As variáveis avaliadas foram: fitomassa seca total da planta e do fruto, e absorção de nutrientes total da planta e frutos. Os frutos passaram a acumular maior quantidade de matéria seca a partir dos 200 dias, atingindo aos 236 dias 41% da fitomassa seca total da planta. O teor de potássio na planta ao final do ciclo foi cerca de quatro vezes superior ao conteúdo de nitrogênio, seguido do fósforo. PALAVAS-CHAVE:Carica papaya L; Macronutrientes; Composição mineral. ABSORPTION OF NUTRIENTS ACCORDING TO PAPAYA CULTIVATION STAGES SUMMARY:The objective of this work was to evaluate the nutrient absorption by papaya as a function of the growing seasons. The plants were collected in commercial orchards located in the municipality of Baraúna-RN. The experimental design was a completely randomized design with five treatments that corresponded to days after transplanting (87, 145, 176, 236, 285) and four replications. The evaluated variables were: total dry plant biomass of the plant and fruit, and total nutrient absorption of the plant and fruits. The fruits accumulated a greater amount of dry matter from the 200 days, reaching to 236 days 41% of the total dry plant biomass of the plant.The potassium content in the plant at the end of the cycle was about four times higher than the nitrogen content, followed by phosphorus.
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