Final report of Research project Study of yielding ability and ecological adaptation of some exotic germplasm of clover cultivars.

The increase of potential of yield on crops, especially Clovers are depended on the benefite use trom affect ecological factors on physiological, Morphological characters and yield. In order to determine forage yield and ecological adaptation different clover cultivars, the experimental was carrid out in randomaized complete block design with three replications and 13 treatments. The results showed that mean of forage and dry matter yield of c10ver cultivars in during three years in fall planting was higher trom spring planting. Therefore faJl planting is recommended for all clover cultivars in region Karaj. In total years in fall and spring planting the highest forage yield with 51.18 and 63.94 t/ha. . and the highest dry matter yield with 8.13 and 8.67 t/ha is belong to persian clover cv. Aleshtar. The results of combined analysis showed that the effect of year, planting method (fall-spring), cultivars and interaction effects between factors ITom point of view forage and dry matter yield were significant at %1 level, and this results comfirme that forage and dry matter yield of clover cultivars are effected by year and planting method, and also this factors were significant affected on presenting potentiol of forage product and ecological adaptation of clover cultivars. Laid clover with leaf.stem ratio of 200.8 (quality yield) in fall and spring platning have the highest quality yield. In between cuts, &ist cuts in spring planting and the second cuts in fall planting, the highest amount and percentage of forage and dry mater yield is allocated by themselves. Among of years, 2001 years from point of view forage yield 26 percentage, dry matter yield 20 percentage was superior to other years ratio. Ingeneral variation trend of forage and dry matter yield of clover cultivars from 1999 to 2001 years and from spring planting to fall planting are increased. Also the experimental results showed that forage and dry matter yield of Berseem clover cv. Tolid-e-Karaj and Zemestangozar in fall planting superior from spring planting, and maximum forage yield in Zemestangozar cultivars in fall planting where high tolerant cold ITom tolid-e¬ Karaj cultivar is superio.r and whenever cold get increased, This different is highlight. Fro.m paints o.f view early maturity, cuts numbers and cold resistant was different between clover cultivars, whereas nom points of view of early maturity of Laki clover, cut numbers Laki clover with one cut, cold resistant Laki and Red clover are identified cultivars. The experimental results shown that from points of view of forage and dry matter yield of clover cultivars are divided in to three categoris: Low yield (Laki clover), medium yield (majurity cultivars) and high yield (Aleshtar clover). Combined analysis results shown effects planting method (spring-fall), cultivars. interaction planting method x cultivars for all morphological characters are significant at %1 level. Means comparison sho.wn that plant height, internode space and branches number in main stem in fall planting and regrowth rate and leaf¬stem ratio in spring planting were superio.r. Also from paints of view plant height o.n Berseem clo.ver cv. Tolid-e-Karaj with 51.38 em, interno.de space an persian clover cv. Eqlid-e-fars with 12.15 cm, branches number in main stem o.n persian clo.ver cv. Maral with 4.16 No. and regrowth rate on red clover cv. F.A.O with 206.20 gr/m2 dry matter are the best cultivars. Key word: Clover Cultivars, Fo.rage and dry matter yield, Ecological adaptation, Morphological characters.