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  • Author or Editor: Michael D. Frost x
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Improving the quality of water released from containerized production nurseries and greenhouse operations is an increasing concern in many areas of the United States. The potential pollution threat to our ground and potable water reservoirs via the horticultural industry needs to receive attention from growers and researchers alike. `Orbit Red' geraniums were grown in 3:1 peat:perlite medium with microtube irrigation to study the effect of fertilizer source on geranium growth, micronutrient leaching, and nutrient distribution. Manufacturer's recommended rates of controlled-release (CRF) and water-soluble fertilizers (WSF) were used to fulfill the micronutrient requirement of the plants. Minimal differences in all growth parameters measured between WSF and CRF were determined. A greater percentage of Fe was leached from the WSF than CRF. In contrast, CRF had a greater percentage of Mn leached from the system than WRF during the experiment. Also, regardless of treatment, the upper and middle regions of the growing medium had a higher nutrient concentration than the lower region of medium.

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Field studies were conducted in Kansas, Nebraska, and Oklahoma in 1996 to evaluate the influence of nitrogen (N), phosphorus (P), and potassium (K) applied alone or in combination on the establishment rate of buffalograss [Buchloe dactyloides (Nutt.) Engelm.] from seed. `Cody' buffalograss burrs were planted at 98 kg·ha-1. Nitrogen was applied at 0 or 49 kg·ha-1 at planting and at 49 kg·ha-1 weekly or every other week for 5 weeks after seeding (WAS). The total N amounts applied were 0, 49, 147, or 294 kg·ha-1. Phosphorus and K were applied at rates of 0 or 49 kg·ha-1 at planting only. Percent buffalograss coverage ratings were taken weekly for up to 11 WAS. Buffalograss coverage was enhanced by N rates up to 147 kg·ha-1. Application of P improved buffalograss establishment at the Nebraska and Oklahoma sites but had no effect at the Kansas site. Potassium application had no influence on establishment at any site. Chemical names used: methyl 2-[[[[(4-methoxy-6-methyl-1,3,5-triazin-2-yl)-amino]carbonyl]amino] sulfonyl]benzoate (metsulfuron methyl); 6-chloro-N,-diethyl-1,3,5-triazine-2,4-diamine (simazine)

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