Among the fruit plants cultivated in Brazil, papaya (Carica papaya L.) stands out by having high productivity of fruit quality. The seedling production system of this culture needs a technology that promotes the production of plants with high physiological and sanitary quality. Thus, we aimed to evaluate the growth, dry matter accumulation and the efficiency of water use of papaya cultivars under doses of bovine biofertilizer in hydroponic culture. We used a completely randomized design with eight treatments in a factorial scheme 4 x 2, with six replications, and a useful plant per repetition totalizing 48 useful plants.

The objective was to evaluate leaf area and gas exchange of okra plants for different irrigation depths, organic matter content and mulch. The activities were conducted in an experimental area of the State University of Paraíba, Campus IV, Catolé do Rocha-PB. An experimental design with randomized blocks, treatments distributed in a factorial 2 × 5 × 2 related to two irrigation levels, 100 and 50% of crop evapotranspiration (ETc), five levels of organic matter in the soil (1.8, 2.8, 3.8, 4.8 and 5.8%) and soil with and without mulch, totaling 20 treatments replicated in four blocks, was used. The experimental unit consisted of 27 plants. The increase of soil organic matter stimulated growth in leaf area and the gas exchange of okra plants. The irrigation with the smallest depth of water inhibited the expansion of leaf area, but provided a greater efficiency in okra's gas exchange. Mulch alleviated the reduced effects of irrigation water depth and stimulated the activity of okra gas exchanges.

This study aimed to evaluate the effect of irrigation with saline water and phosphate fertilization on phytomass accumulation and tissue mineral composition of cowpea shoots. The research was carried out in a greenhouse utilizing randomized block design in a 5 x 3 factorial scheme consisting of five levels salinity of irrigation water (0.5 as control, 1.5, 2.5 3.5 and 4.5 dS m-1) and three doses of P2O5- (60, 100 and 140% from a recommended dose of 60 kg P2O5- ha-1), with 5 replicates. The plants were grown in pots up to flowering and then phytomass accumulation and mineral composition of cowpea (indicate cultivar name) shoot were measured. Irrigation with saline water from 0.8 dS m-1 reduced phytomass accumulation and mineral composition of cowpea plants, making the plants to be considered moderately tolerant up to EC 2.5 dS m-1. The 40% increase in recommended phosphorus dose promotes high iron and copper accumulations and, less sodium accumulation into tissues of cowpea shoot as influenced by saline stress. 60% reduction of the recommended dose of phosphate fertilizer increased the manganese and zinc accumulation of tissues of cowpea shoot under salt stress.

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