Search Results
Abstract
Under subtropical conditions yield response of carrots (Daucus carota L.) was obtained from Ν applications to 112 kg/ha with growth periods greater than 128 days. The adequate level of Ν in carrot tops was 2.8% and 4.0% dry weight when sampled 96 and 49 days after emergence, respectively.
Abstract
Percent hollow stem in broccoli (Brassica oleracea L. Italica group) was increased as N fertilizer rate increased. Hollow stem incidence was greatest at first harvest but declined with each harvest thereafter. The relationship between days to maturity and percent hollow stems could be described by a parabolic regression equation which indicated that hollow stem percentage was negligible if time to maturity was 110 days or more.
Abstract
Field studies were conducted under subtropical conditions to determine the influence of N on yield and size distribution of table beets (Beta vulgaris L.) at various dates of harvest. Beet yield was essentially a function of growth time with no response to N when the growing season was <86 days but application of 112 kg N/ha increased yield by 55.8% when the growing season was 140 days. Nitrogen did not influence size distribution of beets when growing season was short but N application increased beet size when growing season was long.
Abstract
Nitrogen applied to ‘Roosevelt’ Boston fern in the greenhouse at 0, 25, 50, 100, 200, and 300 ppm concentrations increased dry weight, frond length, and leaf area up to 200 ppm, but all decreased at 300 ppm.
Abstract
In greenhouse studies, maximum growth of Nephrolepis exaltata (L.) Schott ‘Rooseveltii’ was obtained in an acid (pH 4-5) medium. Dry weight of ferns decreased as pH of the medium increased.
Abstract
Once-over harvest with a mechanical harvester is becoming more important in the production of many crops. This is particularly true for southern peas because a major item of expense in production of the crop is harvesting if hand harvested. Recently, research was reported concerning the use of 2,3,5-triiodobenzoic acid (TIBA) for increasing adaptability of southern peas for mechanical harvest (3). The work by Hipp and Cowley (3) indicated better plant geometry for mechanical harvest but only a slight increase in yield when peas were grown on 38-inch beds. Prevatt and Lundy (4) reported smaller, more compact pea plants with the application of TIBA to southern peas. The use of TIBA on soybeans also results in small compact plants but yield increases are generally small when plants are grown on conventional 38-inch rows. Variations in row spacing appears to be the most logical method of increasing yield of peas since TIBA application generally results in reduced plant size (1,2,3,4,5). Experiments were conducted at the Texas A&M University Agricultural Research and Extension Center at Weslaco to evaluate the influence of TIBA and Gibberellin on the yield and growth parameters of California Blackeye No. 5 peas.
Abstract
Zn deficiencies in field grown okra (Hibiscus esculentus L.) were induced with band P applications of 29 and 58 kg/ha. Okra yields were slightly increased with these elements applied alone but P and Zn in combination resulted in highest yields. Yields of okra were reduced when P and Zn concn in 10 to 15 day old plants were less than 0.30% and 40 ppm, respectively.
Abstract
Field experiments were conducted to determine the influence of TIBA and Gibberellin sprays on yield, growth characteristics and chemical composition of ‘California Black eye No. 5’ and ‘Purple Hull Pinkeye’ varieties of southern peas. Yield of peas was slightly increased on both varieties with the application of TIBA. Time of application as well as rate was a critical factor in producing maximum yields. Application of TIBA reduced plant size and concentrated maturity. The application of 50 ppm Gibberellin 5 days after application of 20 g per acre of TIBA further concentrated maturity and increased the desirability of peas for mechanical harvest. Iron concentrations in pea leaves were increased with application of TIBA.
Abstract
An important aspect of media management is achieving and maintaining correct pH for specific plants. Changes in pH occur throughout growth due to leaching, plant roots, irrigation water, and fertilizer application. Periodic monitoring to determine pH changes requires a meter with electrode and a procedure as described by Peech (2) or Richards (3). Techniques for sampling media for electrode determination of pH have been evaluated (1), but these measurements require expertise and financial commitment that may not be available to a grower.
Abstract
Increasing fertilizer rates resulted in increased stolon production, plantlet production, and total plant growth of Chlorophytum. Maximum number of stolons and optimum plant growth were obtained with solutions containing 2g/liter of 20-8.3-14.9 (N-P-K) fertilizer applied twice weekly. Frequent watering resulted in maximum growth at high fertilizer levels while less frequent watering resulted in maximum growth at lower fertilizer levels.