بررسی عملکرد و کیفیت علوفه ذرت و سورگوم تحت تنش کم آبی و کاربرد بقایای جو، زئولیت و پلیمر سوپر جاذب در شرایط حداقل خاک ورزی

To study the effects of water stress and the use of barley residue, zeolite and super absorbent polymer on yield and quality of maize and sorghum under minimum tillage an experiment was conducted in two consecutive years (2012-2013) in Kerman. Randomized complete block design, arrangement in factorial split was used with three replications. Water stress in two levels, normal (irrigation based on 70 mm evaporation from pan) and water stress (based on 140 mm evaporation from pan) and plant type included maize and sorghum, as factorial that were considered main plots. Combination treatments of zeolite, superabsorbent polymer and barley residue as subplots that were as follows; 1-10 t ha-1 zeolite+4.5 tha-1 barley residue (ZR), 2- 60 kg ha-1 superabsorbent polymer + 4.5 t ha-1 barley residue (SR), 3- 5 t ha-1 zeolite+30 kg ha-1 superabsorbent polymer+4.5 t ha-1 barley residue (ZSR), 4- 4.5 t ha-1 barley residue (R), 5- Control(C). Maize produced 62.17 and 14.03 t ha-1 fresh and dry forage yield respectively, while the fresh and dry forage yield of sorghum was 47.6 and 9.29 t ha-1 in first cutting and 66.62 and 13.22 t ha-1 in the Sum of the two cutting. In both plants crude protein and forage yield under water stress increased and decreased respectively. Application of 10 t ha-1 zeolite with 4.5 t ha-1 barley residue (ZR) had the highest and lowest forage yield and crude protein respectively. Corn had the better forage quality than sorghum with having lower NDF and ADF. Based on the results for a double cropping system in the temperate zones of Kerman is recommended maize planting under minimum tillage with application of 10 t ha-1 zeolite and 4.5 t ha-1 barley residues.