Strawberry culture is economically important because its fruits are widely consumed in natura, in unprocessed and processed forms, by a variety of industries. Currently the semi-hydroponic cultivation of this crop has been gaining space in relation to soil cultivation, which makes it important to identify, through studies, different systems, cultivation sites, as well as the use of different substrates. The objective of this study was to analyze the agronomic response of Camarosa strawberry cultivar in an out-of-soil system with the use of alternative substrates at different densities. The experiment was carried out in Pelotas-RS, in the locality of Monte Bonito (31°39'44''S, 52°27'29''W at 52.46 m altitude). The experimental design was completely randomized in a subdivided plots scheme, with three replications. In the main plots were allocated three substrates composed of carbonized rice hull, organic compost and tungue pie, and in the subplots, the planting densities of 9, 10, 12, 16 and 20 m-2 plants were allocated. The vegetative growth and the fruit production of the Camarosa cultivar were evaluated. It can be concluded that the addition of organic compound and tungue pie to the carbonized rice hull favors the development of the plants, the production and size of strawberry fruits in the semihydroponic system adopted. The density of 20 plants m-2 confers higher productivity for the cultivar Camarosa.
Nitrogen (N) is the element supplied by the soil that limits the development of irrigated rice. The hypothesis of the present is that to meet higher demand for N by the plant due to the higher potential yield, it is not necessary to apply a higher dose of N fertilizer. This studyevaluated the efficiency of N utilization, the rate of growth and accumulations of N by plants and the grain yield of two rice cultivars, short cycle and medium cycle, with and without N fertilization. A field experiment was installed in the Rio Grande do Sul, southern Brazil. The treatment factors evaluated were cultivar, with medium and short cycles, with doses of 0 and 150 kg N ha-1. Growth curves, absorption rate, N content and leaf area index over time, root area and grain yield were analyzed. The medium cycle cultivar has a greater potential to explore the environment when compared to the short cycle rice cultivar, both for greater leaf area and root area per cultivation area, as well as for longer exploration times. Thus, the medium cycle cultivar has greater N utilization efficiency and higher grain yield.
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