12种禾本科栽培牧草根系研究

STUDY ON ROOT SYSTEM OF 12 FORAGE GRASS CULTIVERS

对我省引进的12种栽培禾草根系观测结果表明,每亩根系重量468.9～871.2公斤,亩产鲜草1107～3087公斤,刈割3～5次,根系重量分别与地上部鲜草产量和根系体积之间呈极显著的回归关系,y_1=-21.9293+5.5715x_1,r_1=0.9534,y_2=-5.4935+1.2199x_2,r_2=0.9899;根系主要分布在0～20cm土层中,占根系总量的85.7～92.6％,在我省气候条件下,12种禾草均能正常生长,四季青绿。

The results of surveying on root system of 12 forage grass cul-tivers introduced to Guizhou showed as follow.Weight of root system was 468.9-871.2kg/mu;yield of fresh forage was 1107-3087 kg/mu; rate of mowing was 3 - 5 times within a year.A highly significant correlation existed between the weight of root system and yield of fresh forage, and volume of root system respectively (y1 = -21.9293 + 5.5715x1, r1 = 0.9534; y2=-5.4935 + 1.2199x2,r2 = 0.9899).The root system distributed mainly in soil layer of 0-20cm occupied 85.7-92.6% in total amount.12 species or varieties of forage grasses all grew normally and kept four-seasons green under the weather of Guizhou.