Estudos que visam avaliar se as quantidades de potássico aplicadas estão sendo aproveitadas para melhorar a fertilidade do solo e se têm influência na produtividade das hortaliças são de extrema importância para o adequado manejo da adubação potássica. Neste sentido, objetivou avaliar os efeitos da época de aplicação e de doses de fertilizantes potássicos na produtividade da cultura do rabanete. O delineamento experimental utilizado foi o de blocos casualizados em esquema fatorial 2 x 5 com quatro repetições. Os tratamentos resultaram da combinação de duas épocas de aplicação (semeadura e cobertura) e cinco doses de potássio (0, 30, 60, 90 e 120 kg ha-1), na forma de cloreto de potássio. A colheita foi realizada 20 dias após a semeadura do rabanete. As variáveis avaliadas foram: índice relativo de clorofila, concentração de potássio nas folhas, comprimento de raízes, diâmetro de raízes, matéria fresca da parte área, matéria seca da parte aérea e raiz. As épocas de aplicação de potássio influenciaram no desenvolvimento e produtividade de rabanete. As doses de potássio influenciam na concentração de K nas folhas e índice relativo de clorofila nas folhas de rabanete.
Invasive plants may present allelopathic substances that interfere with the germination and initial development of seedlings of various species. The objective of this study is to evaluate the physiological quality of cabbage and tomato seeds in the presence of different concentrations of purple nutsedge extract. The seeds were left to germinate in different substrates. Individual experiments were performed for both species. Five concentrations (0, 25, 50, 75 and 100%) of aqueous extract obtained from tubers of Cyperus rotundus were used. The seeds of each species were placed to germinate in three types of substrates (sand, commercial, and paper). Germination, normal seedlings, abnormal seedlings, non-germinated seeds, germination speed index, and accelerated aging were evaluated. A completely randomized experiment with a 3 × 5 factorial design (three substrates and five concentrations of purple nutsedge extract) was conducted with four replications. For the substrates, the means were compared by Tukey test at 5% probability. Polynomial regression analyses were carried out for concentrations of purple nutsedge extract. Cyperus rotundus exerts allelopathic effects on the germination of tomato and cabbage seeds. As the concentration of the tuber extract increases, the inhibitory effect increases, thus reducing germination and seed vigor in the different substrates. The commercial substrate for tomato and the paper substrate for cabbage may minimize the allelopathic effects of Cyperus rotundus extract during germination of seeds.
The use of nitrogen (N) fertilization has been shown to increase the quality and production of cucumber. Thus, the goal of this work was to evaluate crop management practices with and without shoot pruning and the application of N in a pickling cucumber crop under greenhouse conditions. The experiment was conducted in a greenhouse at the Goiano Federal Institute, Urutaí Campus. The experimental design involved randomized blocks in a 2×5 factorial arrangement, with two different management treatments (with and without pruning) and five doses of N (0, 50, 100, 150 and 200 kg ha -1 N), with four replicates. The doses of N were split among three applications at 15, 30 and 45 days after plant emergence. Each plot contained ten plants with a 0.2-m spacing between plants and a 0.8-m spacing between rows. The four central plants in each plot were evaluated, and the following assessments were performed: leaf N content, relative chlorophyll index, stem diameter, fruit length, fruit diameter, number of fruits, fruit fresh mass, fruit dry mass, shoot fresh mass, production per plant and total yield. The data were subjected to analysis of variance (F test) at the 5% probability level, and when significant effects were observed for the N doses, regression analyses were performed. Management with and without pruning directly influenced the production of pickling cucumber. The doses of N influenced the development and yield of cucumber under greenhouse conditions.
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