تاثير انواع شخم و مديريت بقاياي گياهي بر عملكرد و اجزاء عملكرد ذرت در تناوبهاي متقاوت زراعي

Effect of tillage methods and residue management on corn yield and yield components in different rotations

In order to investigate the effect of different tillage methods and residue management on agronomic criteria of maize, an experiment was conducted during growing seasons of 1375-76 and 1376-77. This experiment was on the basis of a split - split plot design with 4 replication. Treatments were different combination of 2 levels of residue (a:without residue, b:3 ton residue/hectar) 3 levels of tillage methods (a:no tillage, biminimun tillage, C:conventional tillage) and 3 different rotations (1):wheat - corn - wheat - sesame, (2):wheat - sesame - wheat - corn, and (3):wheat - fallow - wheat - corn. Cultivar used was 30i. Rotations, tillage methods and residue application had no effect on maize yield. Number of ears/plant, number of kernels/ ear, kernel weight/ear, 100 kernel weight and protein content were not affected by tillage methods and residue treatment; however, total harvest index in conservation tillage methods (no tillage and minimum tillage) without residue, was increased. Corn yield was not affected by rotation. Hypotetical substitution of Corn with sesame in rotation (1) and (2) could cause a significant increase in economic output.