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- Author or Editor: Timothy K. Broschat x
- Journal of the American Society for Horticultural Science x
All leaves from 10 replicate Cocos nucifera L. `Malayan Dwarf' (COC) and Phoenix canariensis Chabaud (CID) trees were sampled for leaf nutrient analysis. In addition, the leaflets of the youngest fully expanded leaves and the third oldest leaves were divided into five groups along the primary leaf axis and these leaflets were then cut into thirds to determine nutrient distribution patterns within leaves and leaflets. Nutrient remobilization rates were calculated for N, P, K, Mg, and Mn. Results showed that N, P, and K were highly mobile within and between leaves of both species of palms. Up to 31% of the N, 66% of the K, and 37% of the total P in the oldest leaves were ultimately remobilized to newer leaves within the palm. Magnesium remobilization rates averaged ≈71% for CID but only ≈10% for COC. The middle-aged leaves appeared to be the primary sink for Mg in COC, rather than the youngest leaves as in CID. Manganese was also quite mobile in both species, with up to 44% of the total Mn remobilized in CID. Samples consisting of recently matured leaves were determined to be the most appropriate for Ca, Fe, Mg (COC only), and Zn, but oldest leaves are more suitable for N, P, K, and Mn analysis.
Abstract
Principal component analysis of soil and foliar analysis and plant quality data for field-grown Salvia splendens Sello cv. Red Pillar was useful for pointing out relationships among these variables and suggested possible growth limiting factors. Soil P and foliar P, Ca, Cu, Zn, and N were found to be positively related to plant quality on the first principal component, whereas soil K, Ca, Mg, and NO3 and foliar Fe were negatively related to quality. The former elements are thought to be limiting growth in this situation, while the latter elements in some way suppress the uptake or utilization of the deficient elements. The third and fourth components described well known relationships of soil pH with soil and foliar concentrations of several elements.
Abstract
A series of experiments evaluated the effects of seed maturity, seed cleaning, gibberellic acid (GA3) or water presoaking, temperature, and planting depth on the percentage and speed of germination of Chrysalidocarpus lutescens H. Wendl. seed. Effects of temperature, cleaning, and storage container on the viability of stored C. lutescens seed were determined in another set of experiments. Germination was rapid and consistent when yellow to fully ripe seed was exposed to temperatures between 30° and 35°C. Cleaning seed is not essential if planting is done immediately. Presoaking seeds in 1000 ppm GA3 for 48 hr slightly accelerated germination speed, but caused excessive elongation of the resulting seedlings and was therefore not recommended. The best method for long-term storage of C. lutescens seed was to clean yellow to fully ripe seed, air-dry at 80% to 90% RH, treat with a seed protectant fungicide, and store at 23° in tightly sealed polyethylene containers. Optimum planting depth was dependent on the drying potential of the germination site.
Abstract
Extractability (in 1 n NH4OAc, pH 7.0) of Mg, Fe, Mn, Zn, and Cu from a Canadian peat, perlite, and sand medium amended with 6 commercial micronutrient fertilizer mixes was determined over an 80-week period with semi-weekly leaching. With the exception of Fe from FeDTPA, which dropped rapidly from very high levels to almost zero, and Fe from Esmigran, which was not extractable by NH4OAc, levels of all 5 elements from most fertilizer sources decreased slightly during the 1st month but then remained rather constant for the remainder of the 18 month experimental period. Extractable Mn, Zn, and Fe were reduced significantly by the superphosphate in Micromax Plus.