phosphate (PO 4 3− ) can coprecipitate with calcite during thawing, resulting in an underestimation of PO 4 3− in the subsequent nutrient analysis ( Johnson et al., 1975 ). Filtration is a preliminary treatment routinely applied in water analyses that
contrast, total porosity of substrate formulated by locally available materials was higher by 6.5% compared with the crushed tiles substrate ( Table 1 ). Table 1. Nutrient analysis, chemical and physical properties of substrate S 15 :Pum 40 :Per 20 :C 20 :Z
Like many crops, fertilizer practices in blueberry ( Vaccinium sp.) are routinely adjusted by comparing the results of leaf nutrient analysis at a standard time against the known optimal ranges of leaf nutrient concentrations. Effective fertilizer
The dwarfing characteristics of St. Julien and Pixy rootstocks as measured by shoot growth and trunk cross-sectional area (TCSA) was evident. Tree survival was significantly reduced after 3 years on Nemaguard and Pixy rootstocks. None of the elements measured by foliar nutrient analysis were below the minimum for plums; however, significant multiple regression equations for total shoot growth, TCSA, and survivability were evident with R 2 of ≈0.30 in all three cases.
Yield responses of `Blue Vantage' cabbage (Brassica oleracea L.) to P fertilizer and two commercially available biostimulants—ROOTS and ESSENTIAL-were evaluated on soils very high in P fertility. Head yield was not increased with P fertilizer when cabbage was transplanted into soil with Mehlich-3 soil test P indexes ≥ 112 ppm (112 mg·kg-1). Neither of the biostimlants applied as a root drench at transplanting influenced head yield or plant tissue nutrient analysis.
and have higher yield and smaller root systems. With the development of leaf nutrient analysis and its wide adoption for diagnosis of tree nutrient status ( Bould, 1966 ), fertilization practices in orchards are now routinely adjusted by comparing leaf
1 Professor. 2 Assistant Professor. 3 Research Assistant. We acknowledge the support of W.R. Grace and Co. (supplies and nutrient analysis) and Paul Ecke Poinsettias (plant-material). The cost of publishing this paper was defrayed in part by
The poultry industry is a $1 billion industry in Texas, with most production centered in eastern Texas. The nursery industry is a $600 million industry, with 25% of the producers located in eastern Texas. With hundreds of millions of birds produced each year, and each bird producing ≈2 lb of manure, waste disposal is a growing problem. Composted poultry litter was mixed with composted pine bark to create five media with varying percentages of poultry litter as a component: 0%, 5%, 10%, 20%, and 40%. A randomized complete-block design was used with poultry litter rates as main plots and plant species tested as subplots. Five species included: tomato, marigold, Cortaderia selloana, Asian jasmine, and Salvia leucantha. Prior to planting, all 1-gal containers were leached with 1000 ml of water, the leachate collected, and tested for conductivity. Plant growth measurements to be presented include plant height and dry weight. The results of media and leaf tissue nutrient analysis will be presented.
A study was conducted with Dendranthemum ×grandiflorum (Ramat.) Kitamura garden chrysanthemum (`Grenadine', `Nicole', and `Tolima') to evaluate the growth and flowering of these plants grown in 2.6-L (no. 1) black plastic containers compared to plants grown in fiber containers with Cu(OH)2 impregnated into the container walls. For all three cultivars, growth indices, shoot and root dry weights, and total biomass increased for plants grown in fiber containers. Total number of flower buds per plant increased 30% to 32% for `Grenadine' and `Nicole' and 53% for `Tolima' grown in fiber containers. Plants grown in Cu(OH)2-impregnated fiber containers had less root coverage at the container:growing medium interface and no observable root circling in contrast to visible root circling on plants grown in black plastic containers. Foliar nutrient analysis on `Grenadine' showed that K decreased and Fe and Cu increased when grown in Cu(OH)2-impregnated fiber containers. No visible nutrient abnormalities were seen in this study.
Ilex crenata `Helleri' rooted cuttings were container grown for one summer with Osmocote 18N-2.6P-7.6K which was reapplied at different times. Beginning in April and every month thereafter until October, five plants were harvested and separated into roots and shoots for dry weight and nitrogen (N) analysis. Plants that had received a reapplication of Osmocote in June or July were larger in October than those that received no supplemental fertilizer. If reapplication occurred in August or September, no influence on growth was realized. Plants that were not supplemented had lower percent tissue and medium solution N. These data demonstrate that tissue nutrient analysis as well as the medium nutrient levels extracted with the pour-through procedure can be used to determine when reapplication of a slow-release fertilizer is necessary to promote optimal growth.