EED control is one of the most important and expenw s i v e operations in crop production. Basic information about weeds is important to the research worker as well as to the practical farmer.

Synopsis Soluble carbohydrate in orchardgrass, as indicated by fructosan, decreased rapidly during the period of maximum vegetative development—maximum stem elongation and seed head development—indicating that this was a critical period for management. In each of 4 cuttings, fructosan was reduced by increments of N. Large N applications render orchardgrass susceptible to injury, but the combination of high temperature and low soil moisture cause it.

Ladino clover, smooth brome grass. Kentucky bluegrass and bentgrass were grown in greenhouse pots to determine the relative uptake of K by the species when grown separately, and to study the competition for K when Ladino clover was grown in association with each of the three grasses. This was to determine to what extent the theory of differential cation uptake by plants of different root cation exchange capacity can explain the disappearance of legumes from pasture mixtures as a result of plant competition for K. Potassium uptake by plant species at low levels of soil K was closely correlated with root cation exchange capacity. The relative K compatibility was smooth brome (best). Kentucky blue (intermediate) and bentgrass (poorest). Because of the strong attraction and high uptake of K by roots of bentgrass, it was impossible with practical rates of K fertilization to maintain an adequate K supply for the associated Ladino clover.

Synopsis Yields were increased by early initial harvest, by 3‐inch height of cut, and by 400 lb. N/A. Interactions between height of cut and time of harvest, height of cut and rate of N, and time of harvest and rate of N were highly significant. No N response was produced by normal date of harvest plus 1.5‐inch cut. Early stage of maturity was more important than height of cut in the first harvest, but height of cut was more important in subsequent harvests.

Changes in levels of soluble carbohydrate reserves were determined for four turfgrass species under two levels of nitrogen and two levels of potassium fertilization under standard golf course management practices. Soil temperatures and the level of nitrogen fertilization were the most important factors in producing seasonal fluctuations in soluble carbohydrate levels. The main soluble carbohydrate reserves were localized in the stem tissue. The percent total soluble carbohydrates were found to be proportionally higher than the percent total fructose for all species and at all sampling periods.