The Effect of Clipping and Weed Competition upon the Spread of Pasture Grass Seedlings

摘要: INTRODUCTION The drought of the last seven years with its disastrous dust storms has damaged vast areas native prairie as well much cultivated land. Deficient rainfall caused crop failures over large areas, leaving fields without a protective covering. Due to these conditions, wind erosion started dry, loose soil drifting. Large amounts settled on grassland and destroyed plant cover (10). Where vegetation was weakened or destroyed, invaded by such weedy annuals lamb's quarter (Chenopodium sp.), Russian thistle (Salsola pestifer), pig weed (Amaranthus sunflower (Helianthus annuus). severe competition ruderals further point where, in many cases, it completely destroyed. These conditions have brought about an increased activity field range research. Until recently there been relatively little research work done revegetation greater part experimental work, prior drought, carried out intention using domestic forage plants revegetate depleted ranges (8). present needs are more data methods handling them areas. It is practical obtain this information small plots than where improper might prove too *ostly. To provide needed information, experiment set up at Hays, Kansas, spring 1939 determine effect clipping spread pasture grass seedlings. RELATED STUDIES Most relative fertilizing upon yield composition forage. Leukel, Camp, Coleman (3) Robinson, Pierre, Ackerman (5) worked nitrate growth, behavior grasses. Richardson, Trumble, Shapter Australia (4) studied influence growth stage frequency cutting Phalaris tuberosa. They found that frequent reduced tops extent root system. Two three cuttings year, however, had tendency increase yield. Nearly all revegetation, until very recently, west southwest use imported species