测定9个苏丹草(S orghum sud anense)品种抽穗期饲草常规营养成分含量和农艺性状的差异,对品种间差异显著的粗蛋白质、粗纤维和粗脂肪含量以及出苗至抽穗期的日数等5个农艺性状进行通径分析。结果表明:出苗至抽穗期的日数、主茎节数和...测定9个苏丹草(S orghum sud anense)品种抽穗期饲草常规营养成分含量和农艺性状的差异,对品种间差异显著的粗蛋白质、粗纤维和粗脂肪含量以及出苗至抽穗期的日数等5个农艺性状进行通径分析。结果表明:出苗至抽穗期的日数、主茎节数和单株分蘖数对粗蛋白质、粗纤维和粗脂肪含量的直接影响和综合作用最大,并且是主要的限制性因素;出苗后生长快、抽穗早、主茎节数少、单株分蘖多的苏丹草植株、品系或品种和营养价值较高;在苏丹草品质育种中可选用出苗到抽穗期日数和主茎节数作为主要选育指标,并适当考虑单株分蘖数指标进行亲本或后代选择。展开更多
Sudangrass and ryegrass rotation is a new type of cropping system in Jianghan Plain,which develops very fast in recent years.So,it is essential to work out the optimal nutrients and water management measures in this n...Sudangrass and ryegrass rotation is a new type of cropping system in Jianghan Plain,which develops very fast in recent years.So,it is essential to work out the optimal nutrients and water management measures in this new system.The effect of NPK fertilizer on yield of forage grass,nutrients and water utilization under sudangrass and ryegrass rotation was studied through continuous pot experiments for three years.The results showed that NPK combination could significantly improve the yield of forage grasses.The total yields during the periods of 2005-2006,2006-2007 and 2007-2008 were 1 690.0,2 091.3 and 1 770.7 g/pot,respectively.The yields in PK treatment were 700.7,1 256.9 and 856.3% lower than those of NPK treatment,while the yields in NK treatment were 426.3,384.9 and 792.3% lower than those of NPK treatment,respectively.Similarly,the yields in NP treatment were 15.9,4.4 and 10.6% lower than those of NPK treatment,respectively.The NPK combination was found to improve the nutrients uptake,and the total N uptakes during the above periods were 10.0,14.8 and 10.6 times higher than that of PK treatment,respectively,and 3.7,1.8 and 5.1 times higher than those of NK treatment,respectively,but,were similar to NP treatment.The total P uptakes were 4.6,6.8 and 5.3 times higher than those of PK treatment,and were 2.4,2.3 and 2.9 times higher than those of NK treatment,respectively,but were similar to NP treatment.The total K uptakes were 5.2,8.4 and 4.9 times higher than that of PK treatment,3.9,2.3 and 3.9 times higher than those of NK treatment,and 80.9,57.4 and 200.5% higher than those of NP treatment,respectively.Water productivity for three years time periods were 16.5,16.1 and 16.2 kg m-3,and were 3.8,5.4 and 4.2 times higher than those of PK treatment,2.3,1.3 and 2.6 times higher than those of NK treatment,and were 16.4,8.8 and 22.4% higher than those of NP treatment,respectively.The soil pH was decreased and soil organic matter was increased in all treatments with increase in the time of sudangrass and ryegrass ro展开更多
文摘测定9个苏丹草(S orghum sud anense)品种抽穗期饲草常规营养成分含量和农艺性状的差异,对品种间差异显著的粗蛋白质、粗纤维和粗脂肪含量以及出苗至抽穗期的日数等5个农艺性状进行通径分析。结果表明:出苗至抽穗期的日数、主茎节数和单株分蘖数对粗蛋白质、粗纤维和粗脂肪含量的直接影响和综合作用最大,并且是主要的限制性因素;出苗后生长快、抽穗早、主茎节数少、单株分蘖多的苏丹草植株、品系或品种和营养价值较高;在苏丹草品质育种中可选用出苗到抽穗期日数和主茎节数作为主要选育指标,并适当考虑单株分蘖数指标进行亲本或后代选择。
基金supported by the International Plant Nutrition Institute (Hubei-22)
文摘Sudangrass and ryegrass rotation is a new type of cropping system in Jianghan Plain,which develops very fast in recent years.So,it is essential to work out the optimal nutrients and water management measures in this new system.The effect of NPK fertilizer on yield of forage grass,nutrients and water utilization under sudangrass and ryegrass rotation was studied through continuous pot experiments for three years.The results showed that NPK combination could significantly improve the yield of forage grasses.The total yields during the periods of 2005-2006,2006-2007 and 2007-2008 were 1 690.0,2 091.3 and 1 770.7 g/pot,respectively.The yields in PK treatment were 700.7,1 256.9 and 856.3% lower than those of NPK treatment,while the yields in NK treatment were 426.3,384.9 and 792.3% lower than those of NPK treatment,respectively.Similarly,the yields in NP treatment were 15.9,4.4 and 10.6% lower than those of NPK treatment,respectively.The NPK combination was found to improve the nutrients uptake,and the total N uptakes during the above periods were 10.0,14.8 and 10.6 times higher than that of PK treatment,respectively,and 3.7,1.8 and 5.1 times higher than those of NK treatment,respectively,but,were similar to NP treatment.The total P uptakes were 4.6,6.8 and 5.3 times higher than those of PK treatment,and were 2.4,2.3 and 2.9 times higher than those of NK treatment,respectively,but were similar to NP treatment.The total K uptakes were 5.2,8.4 and 4.9 times higher than that of PK treatment,3.9,2.3 and 3.9 times higher than those of NK treatment,and 80.9,57.4 and 200.5% higher than those of NP treatment,respectively.Water productivity for three years time periods were 16.5,16.1 and 16.2 kg m-3,and were 3.8,5.4 and 4.2 times higher than those of PK treatment,2.3,1.3 and 2.6 times higher than those of NK treatment,and were 16.4,8.8 and 22.4% higher than those of NP treatment,respectively.The soil pH was decreased and soil organic matter was increased in all treatments with increase in the time of sudangrass and ryegrass ro
