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《Acta Prataculturae Sinica》 2017-01
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Effects of different cutting height and frequency combinations on growth and production performance of hybrid giant napie

GUO Xiao;DENG Hong-Yu;HU Hua-Feng;LI Jian-Ping;HUANG An-Qun;BAI Chuang-Jun;TANG Jun;Zhengzhou Key Laboratory of Ruminant Nutrition,Henan Animal Husbandry and Economy Institute;Tropical Crops Genetic Resources Institute,Chinese Academy of Tropical Agricultural Sciences (CATAS);  
This experiment was designed to explore the effects of cutting regime on growth characters and production performance of hybrid giant napie(Pennisetum sinense)planted on Yellow River flood plain,and consisted of a factorial combination of four cutting heights(cutting at 5,10,15 and 20cm)and 4cutting frequencies(cutting interval 30,40,60 and 120d),to address some difficult problems with this species,including short utilization period,low yield,poor forage quality,and a high incidence of lodging with this cropplanted in Yellow River flood plain under continental climate.The cutting regime had a significant effect on the growth and production of hybrid giant napie.Multiple cutting within a growing season decreased stem to leaf ratio(S/L ratio)and leaf area index(LAI),while optimal cutting(cutting at 15-20 cm height and 60dintervals)raised fresh biomass to dry matter ratio(F/D ratio),tiller density,and growth rate,compared to other treatments.More frequent and severe defoliation(cutting at 5cm height and 30dintervals)raised F/D ratio and number of single plant tillerings,noticeably decreased incidence of lodging,but decreased re-growth rate which was unfavourable to sustainable and efficient production of forage.The more favourable cutting regimes increased forage yield by14.3%-17.3% compared to that(cutting only at 120 dcutting interval)and the annual forage yield reached 32 t DM/ha.Furthermore,optimal cutting decreased lodging,reducing losses of energy and nutrients at harvest.In conclusion,optimal cutting height and frequency,together with appropriate irrigation and fertilizer regimes were important to achievement of production potential,eliminating unnecessary losses in yield and forage quality.
【Fund】: 河南省高等学校重点科研项目(16B230002);; 河南省财政厅农业技术推广项目(51000698);; 郑州市科技攻关项目(141PPTGG423)资助
【CateGory Index】: S543.9
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