Research On Introduction Experiment And Character Evaluation Of Calcium,Iron And Zinc Of Four Kinds Of Herbage

Herbage is rich in protein and various trace elements,so it is the first choice for raising livestock.Due to natural and social reasons,grassland in China is seriously degraded,and the grassland ecological environment continues to deteriorate.At present,the introduction,planting and selection of high quality herbage is one of the effective ways to solve the contradiction between grazing and grassland degradation,protect the environment and develop high quality and efficient animal husbandry.Mineral elements,especially calcium,iron and zinc,affect the normal physiological function,metabolism and growth of livestock.The mineral nutrition of grassland livestock mainly depends on wild herbage.Therefore,the content of calcium,iron and zinc in the herbage directly affects the health and growth status of herbivorous livestock.In this study,Melilotus albus,Melilotus officinalis,Onobrychis viciaefolia and Agropyron desertorum were used as materials.Firstly,introduction experiments were conducted in Hohhot,Hulunbuir and XilinGol in Inner Mongolia.Secondly,the calcium,iron and zinc characters of four herbage were evaluated,and the suitable local species and species with high content of calcium,iron and zinc were screened out.The conclusion can provide a basis for the introduction and promotion of four herbage species.The main contents and conclusions of this study are as follows:In the introduction experiment,the germplasm resources in China and abroad were evaluated by growth characters,phenological periods,overwintering survival rates and growth status of surviving plants.?1?The quality species suitable for introduction in Hohhot region are as follows,Melilotus albus:B33-1?Canada?,B37-1?Kazakhstan?,B35-2?Orenburg region of Russia?and B36-2?Estonia?;Melilotus officinalis:B24-1?Kazakhstan?;Onobrychis viciaefolia:S26-5?Czech republic?;Agropyron desertorum:B47-8?Saratov region,Russia?.?2?The quality species suitable for introduction in Hulunbuir region are as follows,Melilotus albus:No.17?Vannovo,Russia?,No.21?Australia?;Melilotus officinalis:No.7?Ukraine?.?3?The quality species suitable for introduction in XilinGol region are as follows,Melilotus albus:No.34?Germany?;Melilotus officinalis:No.28?Krasnodar territory,Russia?.?4?Calcium,iron and zinc characters were evaluated by greenhouse cultivation,hydroponic system cultivation and planting on medium.The contents of calcium,iron and zinc in 66 species of Melilotus albus,54 species of Melilotus officinalis,30species of Onobrychis viciaefolia and 15 species of Agropyron desertorum resources were determined by ICP-MS.Among the leaves of four herbages,species with high calcium contents are Melilotus albus No.49 and Melilotus officinalis No.7,species with high iron contents are Melilotus albus No.26 and Melilotus officinalis No.16,species with high zinc contents are Onobrychis viciaefolia No.26 and Agropyron desertorum No.3,which are high quality herbages worth planting.?5?Further physiological analysis was carried out on the growth of Ca²⁺,Mg²⁺,Fe²⁺and Zn²⁺in different concentrations of Melilotus albus,Melilotus officinalis and Agropyron desertorum.The growth of root hairs was inhibited under low[Ca²⁺],high[Ca²⁺]and high[Fe²⁺]culture conditions in Melilotus albus and Melilotus officinalis.Under high[Fe²⁺]culture conditions,the growth of root length and root hairs was inhibited in Agropyron desertorum.The results will contribute to the introduction and promotion of suitable herbage for local environment,as well as the cultivation of high quality herbage with abundant nutrients for livestock.The physiological phenotypes found in the study lay a foundation for further study of herbage.