Járisson Cavalcante Nunes

Comportamento de mudas de nim à salinidade da água em solo não salino com biofertilizante

An experiment was carried out in greenhouse during the period January to April 2010, at Center of Agricultural Sciences of the Federal University of Paraiba, in Areia, Paraiba State, Brazil, in order to evaluate the effects of saline water and bovine biofertilizer on the seedling growth of Indian neem. The substrate was material of a non-saline soil collected in depth of 0-20 cm. The treatments were arranged in a completely randomized design using a 5 x 2 factorial, referring to salinity levels of irrigation water of 0.5, 1.0, 2.0, 3.0 and 4.0 dS m-1, with and without bovine biofertilizer applied to the soil only once after dilution with water (1:1), a day before sowing, in volume corresponding to 10% of the substrate. At 86 days after emergence of seedlings the plant growth in height and principal root length, diameter of stem and root, leaf number and dry mass of roots and shoots of plants were evaluated. The salinity of irrigation water increased the salinity levels in the substrate inhibiting the growth in height, stem diameter, leaf emission by plants, diameter and length of principal root and the dry matter production of roots and aerial parts (leaves + stem) of neem, but with less pronounced decrease in plants under the treatments with bovine biofertilizer.

Esterco líquido bovino e uréia no crescimento e produção de biomassa do maracujazeiro amarelo

This study was carried out in order to evaluate the effect of liquid cattle manure and urea on dry matter production in different parts of yellow passion fruit plants. The experiment was conducted during the period of September 2006 to December 2007, in Remigio county Paraiba State, Brazil. The experimental design was randomized blocks with three replications using the factorial squeme 5 x 2 referring to liquid cattle manure (CLM) diluted with water (W) at levels 0% (0CLM + 4W); 25% (1CLM + 3W); 50% (2CLM + 2W); 75% (3CLM + 1W) and 100% (4CLM + 0W) taking 4 L plant-1 as standard volume of each mixture in soil without and with nitrogen applied monthly from 30 days after the planting to the end of the experiment. At 420 days after planting, were obtained the stem diameter and the number of productive branches of the plants; then, the plants were collected, each plant was divided in root, stem, lateral and productive branches and was obtained the dry matter of each part of the plant. The results showed that the interaction liquid cattle manure x nitrogen exercise significant effect on stem diameter, productive branches and biomass of the root, stem, leaves, lateral and productive branches, but with statistic superiority to plants with cattle liquid manure and urea applied to the soil.

Growth and nutrient accumulation in mycorrhized papaya seedlings cultivated in a phosphorus-fertilized substrate

The indiscriminate use of mineral fertilizers in papaya orchards has increased production costs, and the use of arbuscular mycorrhizal fungi is a promising alternative to reduce such expenses. Therefore, the present research aimed at studying the efficiency of arbuscular mycorrhizal fungi (AMF) on dry matter and nutrient accumulation in Sunrise Solo papaya seedlings, by applying doses of P2O5 (triple superphosphate) that are harmful to the symbiosis. The experiment was carried out in a protected environment and was set up in a randomized block design with four replications, and consisted of four P2O5 doses (0, 672, 1386 and 2100 mg dm-3), three mycorrhizal fungi species (Gigaspora margarita, Entrophospora colombiana and Scutellospora heterogama) and the control treatment (mycorrhiza-free). Shoot and root dry matter as well as nitrogen, phosphorus and potassium contents in leaf and root tissues were assessed. Mycorrhizal inoculation promoted a 30% increase in shoot dry matter in relation to the control treatment. Mycorrhizal fungi promoted increases in leaf and root nitrogen content up to 672 mg dm-3 P2O5. Inoculation of E. colombiana favored the highest gains in root and shoot dry matter. P2O5 fertilization increased foliar and root phosphorus content.