+ Site Statistics
+ Search Articles
+ Subscribe to Site Feeds
Most Shared
PDF Full Text
+ PDF Full Text
Request PDF Full Text
+ Follow Us
Follow on Facebook
Follow on Twitter
Follow on LinkedIn
+ Translate
+ Recently Requested

Release of soluble protein and nitrogen in alfalfa medicago sativa 3. influence of shading

Release of soluble protein and nitrogen in alfalfa medicago sativa 3. influence of shading

Crop Science 21(6): 859-862

A study was conducted to determine whether shading during growth would influence production characteristics as well as concentration of several N fractions and total nonstructural carbohydrates (TNC) released from alfalfa. Alfalfa was shaded with saran shades [0 (control), 47, and 73% shade] May 12 to June 1 [Period (P) 1], June 30 to July 7 (P2), and Aug. 9-16, 1978 (P3). Total N (TN), total soluble N (TSN), soluble nonprotein N (SNPN), soluble protein N (SPN), and total nonstructural carbohydrates (TNC) were determined. The 73% shade reduced yields 42% for P1, 30% for P2, and 24% for P3, while the 47% shade reduced yields 29% for P1, 22% for P2, and 10% for P3 compared to the respective control yields. In PI (20 days of shade), concentration of SNPN in herbage was 10.1 mg/g dry wt for control, 10.5 mg for 47% shade, and 11.5 mg for 73% shade, while that of SPN was 14.8 mg for control, 13.8 mg for 47% shade, and 12.6 mg for 73% shade. In P2 (7 days of shade), concentrations of TN, TSN, and SNPN in herbage increased as shade increased. Shade did not significantly influence the herbage concentrations of SPN in P2. In P3 (7 days of shade), shade did not significantly affect herbage concentrations of any of the N fractions. Shade of 73% reduced the TNC concentrations in herbage 16% for P1, 44% for P2, and 19% for P3, while shade of 47% reduced TNC 8% for P1, 28% for P2, and 10% for P3, compared to that in control herbage. Reduced apparent bloat potential of alfalfa, as estimated by SPN release, occurred only in plants grown under low solar radiation for a continuous 20-day period. However, both short and long periods of decreased solar radiation caused decreased TNC concentrations in herbage. Because an abundant supply of TNC is essential for the microbial activity that leads to gas production in the rumen, even relatively short periods of shade could be considered as potentially bloat suppressing. The usual incidence of cloudy weather is not likely to be a major mediator of bloat incidence in ruminants that graze alfalfa, although periods of high solar radiation may be considered bloat-promoting rather than bloat-suppressing.

(PDF emailed within 1 workday: $29.90)

Accession: 006306452

Download citation: RISBibTeXText

Related references

Release of soluble protein and nitrogen in alfalfa medicago sativa 2. influence of potassium and nitrogen fertilizer on 3 cultivars. Crop Science 21(6): 852-855, 1981

Release of soluble protein and nitrogen in alfalfa medicago sativa 1. influence of growth temperature and soil moisture. Crop Science 21(6): 843-849, 1981

Influence of climatic and soil factors on the release of soluble nitrogen and protein from alfalfa (Medicago sativa L.) cultivars. Dissertation Abstracts International, B 41(3): 770, 1980

Influence of temperature, nitrogen, and potassium on growth measures, herbage and protein yields, concentrations of nitrogenous fractions, minerals, and total nonstructural carbohydrates in alfalfa (Medicago sativa L.). Dissertation Abstracts International, B 32(6): 3112-3113, 1971

The influence of temperature and nitrogen on growth as well as nodule formation and nitrogen fixation of alfalfa (Medicago sativa L.) and red clover (Trifolium pratense L.). Albrecht-Thaer-Arch, 13: 8, 711 Bibl. 12, 1969

The action of mineral nitrogen on the symbiosis of nitrogen fixation in alfalfa. 1. The effect of fertilization with calcium-ammonium nitrate on the formation of nodules, yield and nitrogen content in alfalfa hay (Medicago sativa L.) in gajnjaca and parapodzol. Zemlj. Biljka. 17: 2, 227-42. Bibl. 23, 1968

Study on the cultivation of alfalfa (Medicago sativa L.) on hill land. 1. Effect of Rhizobium inoculation method on the early growth of alfalfa (Medicago sativa L.). Research Reports of the Rural Development Administration, Livestock 34(2): 51-56, 1992

Influence of potassium fertilization rate and form on photosynthesis and nitrogen fixation of alfalfa medicago sativa. Crop Science 21(4): 481-485, 1981

Studies on the production of alfalfa d medicago sativa d part 1 effect of boron application on the growth and yield of alfalfa d medicago sativa d. Research Reports of the Office of Rural Development 12(4): 75-82, 1969

Studies on the production of alfalfa (Medicago sativa). 1. Effect of boron application on the growth and yield of alfalfa (Medicago sativa). Res. Rep. Office rur. Dev., Suwon. 12: 4, 75-82. Bibl. 21, 1969

Influence of pH on yield and N and P nitrogen and phosphorus nutrition of alfalfa grown on an Andic Mission silt loam Medicago sativa, Rhizobium meliloti, nitrogen fixation, acid soils, Idaho. 1983

Influence of nitrogen fertilizer and row spacing of companion crop harvested at forage on the establishment of alfalfa medicago sativa. Canadian Journal of Plant Science 63(2): 443-452, 1983

Genetic proof of 4 enzymatic loci in di- and tetraploid alfalfa (Medicago sativa L.) Medicago sativa subsp. coerulea, Medicago sativa subsp. sativa.1. Agronomie: sciences des productions vegetales et de l'environnement(2): 133-148, 1982

Ploidy effects in isogenic populations of alfalfa medicago sativa 1. ribulose 1 5 bis phosphate carboxylase ec soluble protein chlorophyll and dna in leaves. Plant Physiology (Rockville) 70(6): 1704-1709, 1982

Influence of ph on yield and nitrogen and phosphorus nutrition of alfalfa medicago sativa grown on an andic mission silt loam. Agronomy Journal 75(5): 731-735, 1983