PF 11. Nitrogen and phosphorus fertilization on Clitoria ternatea L. seeds quality

Abstract

Two studies were performed in order to evaluate the effect of N (0, and 200 kg/ha/year) and P (0, 150 and 300 kg/ha/year) fertilization at initial stage, on quality of Clitoria ternatea seeds. In both studies a completely randomized design were used, with 5 and 10 replication respectively. Seeds were collected in 116 days old shrubs, located at Ana Maria Campos farm, a very dry forest area, and weren’t stored. 100 seeds weight were recorded W100. Germination percentage was evaluated GP, in seeds scarificated with sulfuric acid 98 % during 5 min. Daily counts were made during 15 days. N improved (P<.01) W100, 5.74 and 5.97 gr (0 and 200 kg/ha/year), P decreased its values (P<.01), 6.15; 5.6 and 5.82 gr (0, 150 and 300 kg/ha/year respectively). Interaction N*P was significant (P<.01), with values of 5.42; 5.94; 5.86; 6.88; 5.26 and 5.78 gr for combinations N*P: 0-0; 0-150; 0-300; 200-0; 200-150 and 200-300 respectively. GP was affected by N (P<.01) 53.79 and 29.03 % for 0 and 200 kg/ha/year respectively, and by interantion N*P (P<.01), with values of 39.01; 68.51; 53.88; 42.51; 12.27 and 34.01 % for combinations N*P: 0-0; 0-150; 0-300; 200-0; 200-150 and 200-300 respectively. P did not affected this variable. N and P applied during stablisment, affects W100 and GP of Clitoria ternatea seeds.