施肥对重茬甜高梁茎秆品质性状的影响

目的]研究施肥对甜高粱茎秆品质性状的影响，以期克服甜高粱的连作障碍。方法]以甜高粱品种甜杂2号为材料，研究施肥对重茬甜高粱茎秆锤度和粗蛋白含量的影响。结果]长期连作使甜高粱茎秆饲用品质降低。甜高粱重茬种植时，施用重茬肥600ks／hm^2加450kg／hm^2N肥、450ks／hm^2P肥、150kg／hm^2K肥时，甜高梁茎秆的锤度和粗蛋白含量最高，其饲用品质最佳；非重茬时，施用P肥450kg,／hm^2加重茬肥600kg／hm^2时，其品质最好。结论]该研究为克服甜高粱连作障碍提供了必要的科学依据。

Effects of Fertilization on Quality Characters of Continuous Cropping Sweet Sorghum Stem

Objective] The effects of fertilizer on quality characters of continuous cropping sweet sorghum stem were studied to overcome continuous cropping obstacle.Method] The sweet sorghum varieties Sweet 2 was used to study the effects of fertilization on brix and crude protein content of continuous cropping sweet sorghum stem.Result] Continuous cropping obstacle could reduce forage quality of sweet sorghum.When preceding crop was sweet sorghum,employing continuous cropping fertilizer 600 kg/hm2 adding nitrogen fertilizer 450 kg/hm2,phosphate fertilizer 450 kg/hm2 and potassium fertilizer 150 kg/hm2,brix and the crude protein content of sweet sorghum were the highest.When preceding crop wasn't sweet sorghum,employing phosphate fertilizer 450 kg/hm2 and continuous cropping fertilizer 600 kg/hm2,brix and the crude protein content of sweet sorghum were the highest.Conclusion] The research could provide essential scientific evidence for overcoming continuous cropping obstacle of sweet sorghum.