| This paper is conducted on the systematic research of the productive performance and adaptation of cocksfoot {Dactylis glomerata L.) in the lower attitude region in changsha city for five years. The result from this research is as following1 The accumulation quantity of heat time of cocksfoot-seed germination is over 28C .After seeding, the seed of cocksfoot can germinate normally in the lower attitude region in changsha.The significant interrelation (p<0.01) between the rate and the days of emergence is determined by y=15.4056X0.5695 (where r=0.8986,y=the rate of seeds out of ground, X=days).The first 3 days after beginning germination is the peak stage of the process of the cocksfoot-seeds coming up out of ground. The result from this study proves that it helps improve the emergence of cocksfoot seed by coving the pig-dung and/or the plant ash and so on. The best sowing time of cocksfoot is from the last ten-day of September to the first ten-day of November.2 Cocksfoot can finish its whole growth and reproducing process in the lower attitude region in Changsha. It is flowering in the early of May .Its seed ripe stage is usually in the last middle ten-day of June. The temperature from April to June is most appropriate for cocksfoot growing. In this period, the cocksfoot tillering was significantly affected by month-rainfall in the period: y=155.25-0.6569x(r=-0.9791, p<0.01).But,the temperature had no significant (p>.05) to cocksfoot tillering.Due to this fact, in the suitable temperature range of cocksfoot growing, the tillering of cocksfoot is significantly affected by the month-rainfall. The tillering of cocksfoot is of two peaks in a year with May and October separately.The rule of the growth of cocksfoot follows the change from slow to fast and to slow again, with the curve of "S". The fastest growth of cocksfoot occurs in the middle ten-day of April. It reaches the biggest value: 114.5 cm on 30 May.3 The yield above ground of cocksfoot is lowest in the seeding year with 1400g/m2.In the second year of cocksfoot growing, the yield of cocksfoot fresh forage can reach 5935g/m2. The yield of the fresh forage of cocksfoot reaches highest in its third growing year with 7690 g/m2. The yield above ground drops year after year later.4 In the process of cocksfoot growing, the yield above ground of cocksfoot shows increase tendency before flower, It reaches the highest yield at flowering stage for 3115 g/m2. After flowering, the yield above ground of cocksfoot shows declinetendency .The leaves death is the main reason to cause the descend of the yield above ground of cocksfoot. The weight of the stem and ear of cocksfoot increases significantly from flowering stage to seed ripping stage. The LSWR (leaf-to-stem weight ratio) is 4.85:1 in the seed ripping stage. The course of growing and bearing of cocksfoot follows the change of the content of nutrition of cocksfoot. The crude protein shows descend tendency. The content of CP of fresh forage is from 4.4% in the nourishment growth stage to 2.6% in the flowering stage, with descending by 69.23%. The content of crude fiber and nitrogen-free extract (NFE) show increasing significantly tendency. The crude fiber of fresh forage increases from 5.6% to 10.7% .The nitrogen-free extract (NFE) arises from 10.0% to 13.9%.The result from this study shows the leaves of cocksfoot are rich from hearing stage to beginning flowering stage. The yield of CP per unite area is highest, with lower content of NPF. The best time of harvest cocksfoot is from hearing stage to beginning flowering stage.5 In the first growing stage, cocksfoot increases significantly the length and weight of its root. In last growing stage, it increases mainly the numbers and weight of its root. Over 80% of its root spreads in the 10cm surface layer of soil. The interrelation between the growth of the stem-leaf and the root of cocksfoot is in very close coordination. It is of ability of extending significantly under ground in the young seedling stage, and of accumulating the mass above ground in...
|
PDF Full Text Request