The effects of soil moisture content, pot seedling buried depth, and pot seedling height on the survival rate and growth of dry planted seedlings were researched by field experiment. The results showed that the seedli...The effects of soil moisture content, pot seedling buried depth, and pot seedling height on the survival rate and growth of dry planted seedlings were researched by field experiment. The results showed that the seedling survival rate and growth were enhanced with the increase of soil moisture content after pot seedling transplanting, but there was no significant difference in the survival rate and growth of seedlings with 85% and 100% of soil moisture content. Pot seedling buried depth was one of the important factors affecting the survival rate, and when the pot seedlings were buried 2 cm deep, the seedlings showed high survival rate and excellent growth. Under the same condition of soil moisture content and buried depth, seedlings with pot seedling height of 15 cm had the best survival rate and growth. Therefore, the optimized conditions for dry-cultivated rice seedling planting were soil moisture content of 85%, pot seedling buried depth of 2 cm, and pot seedling height of 15 cm.展开更多
Organoarsenics are widely used as growth promoters in poultry industry,resulting in arsenic(As)accumulation in poultry litter.A greenhouse pot study was implemented to investigate the fate of arsenic originated from p...Organoarsenics are widely used as growth promoters in poultry industry,resulting in arsenic(As)accumulation in poultry litter.A greenhouse pot study was implemented to investigate the fate of arsenic originated from poultry litter and their effects on the growth of Brassica napus(oilseed rape),and assess their potential health risks.Five poultry litter application rates(0,5%,10%,20%and 40%)were used,dividing into two groups:one for soil incubation(SI)and the other for plant cultivation(PC).Experimental results indicated that the total arsenic for composted poultry litter was(10.94±0.23)mg/kg,As(V)and As(III)decreased while methylated arsenic increased after 21 d in SI and PC treatments.Seed germination rates were negatively correlated with monomethylarsenic acid(MMA,R2=0.63,p<0.05).The length and biomass of roots and shoots were significantly inhibited by poultry litter,but plant length of 5%treatments was slightly stimulated.Within an average weekly intake of 0.5 kg Brassica napuss,the risk quotient(RQ)values induced from roots nearly all surpassed the acceptable limit(1),were two orders magnitude higher than shoots.According to the potential risk to order,child exhibited the highest risk,adolescent ranked secondly,and adult exhibited the lowest risk.Hence,people should better avoid intake Brassica napus roots to reduce arsenic potential risk.展开更多
文章明确了一株能够明显促进蓝莓生长的菌根真菌的分类地位,通过形态观察结合18S r RNA测序比对结果表明该菌株为晶粒鬼伞菌种(Coprinus micaceus)。同时在蓝莓不同生长期接种该菌,系统研究该菌对蓝莓各生长时期生理生长方面的影响,结...文章明确了一株能够明显促进蓝莓生长的菌根真菌的分类地位,通过形态观察结合18S r RNA测序比对结果表明该菌株为晶粒鬼伞菌种(Coprinus micaceus)。同时在蓝莓不同生长期接种该菌,系统研究该菌对蓝莓各生长时期生理生长方面的影响,结果表明接种该菌后,蓝莓组培苗、驯化苗株高分别比对照高出30.0%,56.1%,盆栽苗生长量比对照高出34.54%。蓝莓顶端叶片激素含量是对照的23倍,蓝莓N,P吸收率显著提高,分别比对照增加12.8%,15.3%。接种菌根菌晶粒鬼伞菌对蓝莓的生长起到明显的促进作用。因此该菌株具有较好的应用前景,可以作为蓝莓生产储备菌株。展开更多
基金Supported by the Key Research and Development Project of Shandong Province(2016GNC111005&2015GNC111019)
文摘The effects of soil moisture content, pot seedling buried depth, and pot seedling height on the survival rate and growth of dry planted seedlings were researched by field experiment. The results showed that the seedling survival rate and growth were enhanced with the increase of soil moisture content after pot seedling transplanting, but there was no significant difference in the survival rate and growth of seedlings with 85% and 100% of soil moisture content. Pot seedling buried depth was one of the important factors affecting the survival rate, and when the pot seedlings were buried 2 cm deep, the seedlings showed high survival rate and excellent growth. Under the same condition of soil moisture content and buried depth, seedlings with pot seedling height of 15 cm had the best survival rate and growth. Therefore, the optimized conditions for dry-cultivated rice seedling planting were soil moisture content of 85%, pot seedling buried depth of 2 cm, and pot seedling height of 15 cm.
基金National Natural Science Foundation of China(No.21177087)the National High Technology Research and Development Program of China(2012AA101405).
文摘Organoarsenics are widely used as growth promoters in poultry industry,resulting in arsenic(As)accumulation in poultry litter.A greenhouse pot study was implemented to investigate the fate of arsenic originated from poultry litter and their effects on the growth of Brassica napus(oilseed rape),and assess their potential health risks.Five poultry litter application rates(0,5%,10%,20%and 40%)were used,dividing into two groups:one for soil incubation(SI)and the other for plant cultivation(PC).Experimental results indicated that the total arsenic for composted poultry litter was(10.94±0.23)mg/kg,As(V)and As(III)decreased while methylated arsenic increased after 21 d in SI and PC treatments.Seed germination rates were negatively correlated with monomethylarsenic acid(MMA,R2=0.63,p<0.05).The length and biomass of roots and shoots were significantly inhibited by poultry litter,but plant length of 5%treatments was slightly stimulated.Within an average weekly intake of 0.5 kg Brassica napuss,the risk quotient(RQ)values induced from roots nearly all surpassed the acceptable limit(1),were two orders magnitude higher than shoots.According to the potential risk to order,child exhibited the highest risk,adolescent ranked secondly,and adult exhibited the lowest risk.Hence,people should better avoid intake Brassica napus roots to reduce arsenic potential risk.
文摘文章明确了一株能够明显促进蓝莓生长的菌根真菌的分类地位,通过形态观察结合18S r RNA测序比对结果表明该菌株为晶粒鬼伞菌种(Coprinus micaceus)。同时在蓝莓不同生长期接种该菌,系统研究该菌对蓝莓各生长时期生理生长方面的影响,结果表明接种该菌后,蓝莓组培苗、驯化苗株高分别比对照高出30.0%,56.1%,盆栽苗生长量比对照高出34.54%。蓝莓顶端叶片激素含量是对照的23倍,蓝莓N,P吸收率显著提高,分别比对照增加12.8%,15.3%。接种菌根菌晶粒鬼伞菌对蓝莓的生长起到明显的促进作用。因此该菌株具有较好的应用前景,可以作为蓝莓生产储备菌株。