CAJ | 학술논문

为了明确鲜食型甘薯干物质及养分积累分配规律与施氮之间的关系，以鲜食型甘薯（YS25和 LS9）为试材，通过盆栽试验研究了不同施氮量对鲜食型甘薯干物质及氮、磷、钾养分积累与分配特性的影响。结果表明，在同一生育期内随着施氮水平的提高，两鲜食型甘薯品种藤蔓干物质及 N、P2 O5、K2 O 的积累量均随之增加，而薯块干物质及N、P2 O5、K2 O 的积累量却表现出先增加后降低的趋势，且过量施氮会降低其在薯块的分配率。随施氮量的增加，两鲜食型品种甘薯形成100 kg 薯干需吸收的养分量也逐渐增加，且 K2 O ＞N ＞P2 O5。总体来说，LS9的 N、P2 O5、K2 O 生产效率及干物质生产效率较高，YS25的养分生产效率及干物质生产效率较低，说明 LS9为养分生理利用高效率品种， YS25为养分生理利用低效率品种。两鲜食型甘薯品种的养分生产效率和干物质生产效率对施氮的反应基本一致，即施氮显著降低其养分生产效率和干物质生产效率。
위료명학선식형감서간물질급양분적루분배규률여시담지간적관계，이선식형감서（YS25화 LS9）위시재，통과분재시험연구료불동시담량대선식형감서간물질급담、린、갑양분적루여분배특성적영향。결과표명，재동일생육기내수착시담수평적제고，량선식형감서품충등만간물질급 N、P2 O5、K2 O 적적루량균수지증가，이서괴간물질급N、P2 O5、K2 O 적적루량각표현출선증가후강저적추세，차과량시담회강저기재서괴적분배솔。수시담량적증가，량선식형품충감서형성100 kg 서간수흡수적양분량야축점증가，차 K2 O ＞N ＞P2 O5。총체래설，LS9적 N、P2 O5、K2 O 생산효솔급간물질생산효솔교고，YS25적양분생산효솔급간물질생산효솔교저，설명 LS9위양분생리이용고효솔품충， YS25위양분생리이용저효솔품충。량선식형감서품충적양분생산효솔화간물질생산효솔대시담적반응기본일치，즉시담현저강저기양분생산효솔화간물질생산효솔。
To clarify of the relationship of nitrogen application with dry matter and nutrient accumulation and distribution of fresh-eating sweet potato,the effects of different nitrogen levels on characteristics of dry matter and N,P2 O5 and K2 O accumulation and distribution of fresh-eating sweet potato have been studied in the pot experi-ment.The cultivars of fresh-eating sweet potato(LS9 and YS25)were selected as experimental material.The results showed that the accumulation of dry matter and N,P2 O5 ,K2 O of YS25 and LS9 shoot were increased with the in-crease of nitrogen fertilizer application in the same developing stage,while those of YS25 and LS9 root-tuber were increased at first,and then decreased,and their distribution rates of root-tuber were decreased with nitrogen supply. The amounts of nutrients which needed for the formation of 1 00 kg dried sweet potato of LS9 and YS25 were in-creased gradually with the increase of amount of N applied,and that was K2 O >N >P2 O5 .In generally,the varieties of LS9 had higher production efficiency of N,P2 O5 ,K2 O and dry matter,while YS25 had lower production efficiency of nutrients and dry matter.It showed that LS9 and YS25 had higher and lower physiological use efficiency of the nutrients separately.Responses of production efficiency of nutrients and dry matter of fresh-eating sweet potato (YS25 and LS9)to nitrogen application were almost consistent,namely production efficiency of nutrients and pro-duction efficiency of dry matter of N,P2 O5 and K2 O of sweet potato were decreased by nitrogen application.