واكنش عملكرد و اجزاء عملكرد كنجد به انواع شخم و بقاياي گياهي در تناوبهاي متفاوت زراعي

Sesame yield and yield components responses to tillage methods and residue management in different rotations

In order to investigate the effects of different tillage methods and residue management on agronomic criteria on sesame (Sesamum indicum L.), an experiment was conducted during }raving season of 137-76 and 1376-77. This experiment was on the basis of split - split plot design with 4 replications. Treatments were different combinations of two levels of residue (without residue and 3 ton of residue / ha): three levels of tillage methods (Conventional tillage, minimom tillage and no tillage); and 3 rotation systems: (I) wheat-maize - wheat sesame, (2): wheat-sesame-wheat - maize, (3) wheat - fallow - wheat - sesame. Cultivar used was local Sirjan population. Yield of sesame was significantly affected by tillage methods in all 3 rotations; however yield in conventional tillage was lower than other tillage methods. Yield was increased with no residue treatment in all rotations. Number of branches / plant was reduced only in rotation (2) with conventioal tillage. Number of capsules r plant was reduced in conventional tillage. Number of seeds/capsules and 1000 - seed weight were not affected by tillage methods and residue application in all rotations; but harvest index was affected only in rotation (3). Yield was not also affected by rotations. Protein and oil content of seeds were not affected by tillage methods, residue management and different rotations. Micro-organisms population and soil bulk density were not also affected by different tillage and residue treatments in any rotation. Protein and oil content of seeds were not affected by tillage methods, residue management and different rotations.