留学生Essay写作—植物生长的环境因素
13页1、http:/ 留学生论文专业定制代写网站留学生Essay写作植物生长的环境因素AbstractDifferent environmental conditions contribute to the limitations of plant growth.Salts are common and a natural constituent of all soils.Normally,salts are present in low amounts in top soil and plant growth is not affected.However,accumulation of salts,through natural means or mans activities,can cause plant growth problems and result in poor growth or death of plants.Considering that Bermuda is such a small island,farmerscrops are constantly being
2、 exposed to salt spray.Therefore,there must be a saline threshold for the various crops.Bermuda is famous for The Bermuda Yellow Onion,therefore I felt it was appropriate to investigate The Salinity Tolerance of the Bermuda Yellow Onion.The objective of this study is to find out if the Bermuda Yellow Onion has a saline threshold,and if so what is this saline limit.To examine this question,I have constructed several small experiments,including the Saline Affect on Biomass,Germination Rate,Onion G
3、rowth,and the Water Content in Soil after Plant Growth.Throughout this investigation,I found that salinity effects both germination and overall growth of the Bermuda Yellow Onion,decreasing the yield percentage produced.The appearance of all plants grown in saline solutions are recognized as an effect of salt stress;poor germination and establishment,reduced plant vigour and stunted growth,smaller than normal leaves,slightly yellowing leaves,and a burnt appearance on tips of leaves.All experimen
4、ts carried out show that salinity has an affect on the osmotic ability of both seed and plant,which has an effect on other plant functions such as photosynthesis and transpiration.Without the plant able to function effectively nor efficiently,the plant will produce fewer yields or eventually die,depending on the salinity strength.This discovery suggests that there is a definite saline threshold for the Bermuda Yellow Onion.IntroductionOriginally,Bermuda grew and exported tobacco,but during the 1
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