Joserlan Nonato Moreira

Desempenho agronômico da cenoura adubada com jitirana antes de sua semeadura

The scarlet starglory is an herbaceous plant native that is presented as a potential source for green manure in the semi-arid northeast of Brazil, and generates many benefits, especially the increased availability of nutrients for crops. The objective of this present study was to evaluate the agronomic performance of carrot fertilized with scarlet starglory before carrot sowing. An experiment was conducted at the teaching garden of the Plant Sciences Department, Universidade Federal Rural do Semi-Arido (UFERSA), Mossoro-RN, from September to December 2008. The experimental design used was a randomized complete block with treatments arranged in a 4 x 4 + 1 factorial scheme, with 3 replications. The first factor was composed of the quantities of scarlet starglory incorporated into the soil (5.4; 8.8; 12.2 and 15.6 t ha-1 on a dry basis), and the second factor by the times of scarlet starglory incorporation into the soil (0; 10; 20 and 30 days before sowing of carrot - DBS). The additional treatment (control) was fertilized with 80 t ha-1 of cattle manure. The characteristics evaluated were: plant height, leaf number per plant, dry mass of shoot, commercial productivity, scrap productivity, classified productivity. There was no significant interaction between the quantities of scarlet starglory incorporated into the soil and its times of incorporation before carrot sowing on any of those evaluated characteristics. The highest productive performance of carrot was obtained in the amount of 15.6 t ha-1 of scarlet starglory incorporated into the soil at the time of 20 days prior to the carrot planting time.

Desempenho agroeconômico da cenoura adubada com jitirana (Merremia aegyptia)

The use of spontaneous plants of the Caatinga biome as green manure is becoming a viable option for vegetable production in northeastern Brazil. Among these plants, the scarlet starglory is a spontaneous plant adapted to the climatic and soil conditions of the region, with high biomass production, rapid growth and low C/N ratio. We evaluated the agroeconomic performance of carrot (cv. Brasilia) depending on added amounts of scarlet starglory under the ground and of its moment of incorporation. The study was carried out in a rural area, in Mossoro, Rio Grande do Norte state, Brazil, from September to December 2009. The experimental design was randomized complete blocks with the treatments arranged in a factorial scheme (4x4) + 1, with three replications. The first factor was comprised of amounts of scarlet starglory placed between the carrot rows, in a depth of 15 cm (5.4, 8.8, 12.2 and 15.6 t ha-1 on a dry basis) and the second factor, of the incorporation moment of this material (0, 15, 30 and 45 days after sowing carrots). The additional treatment (control) was 40 t ha-1 of cattle manure applied 10 days before sowing. We evaluated the marketable and total yield of roots, percentage of the different classes of roots and the economic indicators of gross income, net income, rate of return and profit margin. No significant interaction between the amounts of scarlet starglory under the soil and the incorporation moment was determined in any of the characteristics examined for carrot. The best agroeconomic performance of carrot cropping was obtained by adding 15.6 t ha-1 of scarlet starglory to the soil. The optimization of this performance was achieved with the incorporation moment of 26 days after carrot sowing.

Optimum plot size of planting and bio-agroeconomic revenues from arugula-carrot intercropping systems in a semi-arid region

The production of vegetable crops has been characterized as a highly intensive activity in the use of soil, water, inputs and labor in semi-arid regions, being practiced mostly by small family farmers as a way of subsistence, or in the small-scale commercialization of surplus production. Among the agricultural practices that have been successfully used by vegetable producers are intercrop systems that, when implemented with adequate management, present gains in productivity, nutritional, economic, and environmental value. The aim of this study was to estimate the optimal plot sizes of plantings of carrot (Daucus carota L.) intercropped with arugula (Eruca sativa L.) in bi-cultivation in three spatial arrangements, as well as to determine bio-agroeconomic revenues from associations between these vegetable crops in a semi-arid region. Estimates of optimal sizes of experimental plots in intercropping systems, provided by the methods of bootstrap resampling and of sampling intensity (10%), were four, four and three basic units, respectively, for the spatial arrangements 2R:2C, 3R:3C, and 4R: 4C, between rows of arugula (R) intercropped with carrot (C), and by the Hatheway method, all spatial arrangements were of four basic units. The best bio-agroeconomic performance of carrot intercropped with arugula in bi-cultivation was obtained in the spatial arrangement 2R:2C.