【摘要】 通过田间小区试验,研究不同施氮量对杭白菊养分积累、转运及产量的影响,以确定杭白菊最佳氮肥用量。试验设5个处理,氮素用量分别为0、90 kg/hm2、120 kg/hm2、150 kg/hm2、180 kg/hm2,以N0、N1、N2、N3、N4表示,5次重复。结果表明,不同氮素用量影响杭白菊不同时期干物质和养分的阶段积累量,但不影响其积累趋势,整个生育期内杭白菊氮、磷、钾积累量为钾>氮>磷。不同施氮量影响茎叶氮、磷、钾的转移效率和在不同器官中的分配比率,以不施肥处理最高,N3(150 kg/hm2)次之。在氮、磷、钾三种元素中,转运效率磷>氮>钾。收获期氮、磷、钾在不同器官的分配比率不同,氮素、钾素分配比率为茎>花>叶>根,磷素分配比率为茎>花>根>叶。各处理杭白菊花的产量在1746.232~211.3 kg/hm2之间,以N3(150 kg/hm2)处理产量最高。在本实验条件下,杭白菊的推荐施氮量为150 kg/hm2。更多还原

【Abstract】 Aimed to determine the optimal N application rate,a series of field trials were carried out to investigate the effects of different N application rates on the yields,nutrient distribution and nutrient transformation in Chrysanthemum morifolium.Five N application levels: 0 kg/ha(N0),90 kg/ha(N1),120 kg/ha(N2),150 kg/ha(N3)and 180 kg/ha(N4)were set up with five replications.The area of each plot was 0.8 m×15 m.The results indicated that different N application rates significantly affected dry matter and nutrition accumulations at different growth stages,but did not affect the tendency of accumulation.The order of the accumulation of N,P and K throughout the whole growth period was: K>N>P.N application rates affected transfer efficiency and distribution ratio of N,P and K in different organs.The highest transfer efficiency and distribution rate was found in N0 followed by N3.The order of transfer efficiency of N,P and K was: P>N>K.At the deflowering stage,the distribution rates of N and P was: stem>flower>leaf>root,but the distribution of K was: stem>flower>root>leaf.The yield was ranged from 1746.23 kg/ha to 2211.3 kg/ha,the highest yield was found in N3(150 kg/ha).Under this experimental conditions,the recommended N application for Chrysanthemum morifolium was 150 kg/ha.更多还原