Produção de girassol em diferentes sistemas de cultivo, águas e adubação.

Abstract

Due to the scarcity of good quality water, several alternatives have been to expand supply and increase agricultural activity. O The objective of this work was to evaluate the growth and yield of sunflower (Helianthus annum L. var. EMBRAPA 122 / V-2000) in two cultivation systems, different types of water and doses of boron. In the first experiment the sunflower was grown in soil and irrigated with sewage from domestic and domestic sewage and subjected to increasing doses of boron. The experimental design was in randomized blocks, analyzed in a factorial scheme (5 x 2) with five doses of boron (0.0, 1.0, 2.0, 3.0 and 4.0 ppm) combined with two types of irrigation water (wastewater from domestic sewage and water supply); for each experimental unit we used three repetitions totaling 30 units. It was found that the doses of boron and the types used did not significantly influence the percentage of unviable achenes; however, wastewater affected positively the phytomass production of the shoot. In the second experiment, the growth and yield components of sunflower (var. EMBRAPA 122 / V-2000) cultivated in a hydroponic system, using coconut fiber as substrate. The experimental design used was a completely randomized one. factorial scheme (5x2) with three repetitions, so that five different salinity levels (1.7, 4.3, 5.0, 9.0 and 11.5 dS m "1) and two managements, with one and two plants per pot. It was verified that the differentiated management of the plants of sunflower did not affect crop yield and that the mass of 1000 sunflower achenes hydroponic system and technically viable for salinity up to 4,3dSm ''.