Produ??o de matéria seca e propriedades físicas do solo na consorcia??o milho e braquiária

摘要

The experiment was conducted in the agricultural year 2010/2011, at S?o Salvador farm , located in the City of Toledo / PR . The present work was conducted with objective of evaluate the effect of corn-Brachiaria ( Brachiaria ruzizienses ) intercropping in dry matter production for maintenance of no- tillage system , as well as the physical properties of the soil. The experimental design was randomized blocks . The Treatments consisted of two corn cropping systems : single corn and corn associated with Brachiaria ruziziensis, with ten repetitions . Each plot had an area of one hundred square meters . Was determined the dry matter production using a metallic square with an area that was known alternately disposed in the row and between rows of corn , and all the dry matter contained therein were collected and placed in bags . For determination the soil bulk density , macroporosity , microporosity and total porosity , soil samples were collected at three depths in soil core . Was also determined the resistance to penetration . The results demonstrated that the consortium of pasture with corn influence the amount of dry matter produced. The estimated average production of dry corn intercropping , soon after harvest was 8800 kg ha -1 , while single corn grown in no-till system was 6280 kg ha -1 , therefore, the increase was of 40 % (2,520 kg ha -1 ) on dry matter production with the consortium . The intercropping maize with Brachiaria in a single crop, not promoted improvements in soil physical properties . Resistance to penetration was above 2 MPA at all depths studied . Normal 0 21 false false false PT-BR X-NONE X-NONE /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Tabela normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-priority:99; mso-style-parent:""; mso-padding-alt:0cm 5.4pt 0cm 5.4pt; mso-para-margin-top:0cm; mso-para-margin-right:0cm; mso-para-margin-bottom:10.0pt; mso-para-margin-left:0cm; line-height:115%; mso-pagination:widow-orphan; font-size:11.0pt; font-family:"Calibri","sans-serif"; mso-ascii-font-family:Calibri; mso-ascii-theme-font:minor-latin; mso-hansi-font-family:Calibri; mso-hansi-theme-font:minor-latin; mso-fareast-language:EN-US;}