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  • Author or Editor: G. L. Horst x
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Abstract

A laboratory experiment was conducted to determine relative salt tolerances during germination and seedling growth of 16 tall fescue cultivars (Festuca arundinacea Schreb.). Seeds of tall fescue were germinated on mats floating on saline solutions made from tap water and equal portions of NaCl and CaCl2 up to 7500, 12,500, and 15,000 ppm. The hydroponic growth medium containing 15,000 ppm NaCl and CaCl2 salt was suitable to identify cultivars with potential salt tolerance and commercial value under saline growing conditions. Cultivars which had less than a 50% growth reduction relative to the control were considered salt-tolerant. Broad-sense heritability estimates indicated that germination percentage, blade length, seedling dry and fresh weights, and germination rate (in that order) are viable selection criteria for salt-tolerance screening. The cross-pollination characteristic of the species should enhance improvement through recurrent selection.

Open Access

Abstract

Turfgrass quality usually is related to fertilization management practices. Nitrogen fertilizer formulations are undergoing change in order to produce acceptable turfgrass response and reduce management costs. Field experiments conducted during 1979–81 evaluated the influence of Ca on urea and nitrate N sources on bermudagrass (Cynodon dactylon L.) turfgrass color, quality, verdure, and root-rhizome dry matter production. Color, quality, and verdure were significantly improved and persisted longer with the addition of Ca to urea N sources. Early season root and rhizome production also was increased with the urea + calcium application. Verdure was not significantly affected among the N sources. There was not a significant increase in tissue N content. Addition of Ca to the fertilizer formulation apparently enhanced N utilization.

Open Access

Acidification of < 1% of the effective root zone of a mature pecan tree (Carya illinoensis (Wanghenh.) C. Koch) significantly increased uptake of Zn into the tree and maintained elevated Zn in leaves for 9 years. Sulfuric acid and ZnSO4, applied in a shallow trench, lowered soil pH to a depth of 60 cm and increased volubility of Zn in the acid band. Large concentrations of CaSO4 were formed. Laboratory tests confirmed the movement and volubility of Zn in soils under conditions similar to those in the field. Tree roots did not grow into the acidified band, presumably due to high salinity, but proliferated extensively at the interface of the acidified band and calcareous soil.

Free access