施肥对连作甜高粱生物产量及品质的影响

以沈农甜杂2号甜高粱为材料，研究施肥对连作甜高粱生物产量及品质的影响。结果表明，苗期和成熟期各处理株高显著高于对照；苗期各处理叶片数差异不显著，成熟期P肥和重茬肥加P肥处理的叶片数与对照差异显著；重茬肥加N肥和重茬肥加P肥处理的生物产量显著高于对照，增产率分别达29.6%和28.9%；重茬肥加N、P、K肥处理的锤度和粗蛋白含量均达最高。综合分析表明，施用重茬肥600 kg/hm加P肥450 kg/hm，对甜高粱生长及生物产量的提高作用最佳；施用重茬肥600 kg/hm分别加N、P、K肥450、450、150 kg/hm时，甜高粱的饲用品质最佳。

Effects of Fertilization on Biomass and Quality of Continuous Cropping Sweet Sorghum

The sweet sorghum variety Shongnong Tianza 2 was used as material to study the effect of fertilization on biomass and quality of continuous cropping sweet sorghum stem. The results showed that at seedling and mature stages, plant height of all treatments were higher than CK. For leaf number, no obvious difference between treatments was detected at seedling stage, but obvious difference between treatment 3, 7 and CK detected at mature stage. Biomass of treatment 6 and 7 was obviously higher than CK, with the increasing rate of 29.6% and 28.9% respectively. Brix and crude protein content of treatment 9 were the highest. To sum up, the best effect of hastening growth and improving biomass appeared in the treatment of employing continuous cropping fertilizer 600 kg/hm and phosphate fertilizer 450 kg/hm; however, the best forage quality of sweet sorghum was obtained in the treatment of employing continuous cropping fertilizer 600 kg/hm adding nitrogen fertilizer 450 kg/hm, phosphate fertilizer 450 kg/hm and potassium fertilizer 150 kg/hm.