× Didn't find what you were looking for? Ask a question
Top Posters
Since Sunday
5
o
5
4
m
4
b
4
x
4
a
4
l
4
t
4
S
4
m
3
s
3
New Topic  
tiffany77 tiffany77
wrote...
7 years ago
an outbreak of enteropathogenic escherichia coli has occurred. the source of the epidemic is thought to be alfalfa sprouts. a heterotrophic plate count of the sprouts indicates low levels of bacteria. can you assume that the sprouts are not the source of the outbreak?
Read 2181 times
1 Reply

Related Topics

Replies
wrote...
Staff Member
7 years ago
Yes, according to the following information:

Like other legumes, its root nodules contain bacteria, Sinorhizobium meliloti, with the ability to fix nitrogen, producing a high-protein feed regardless of available nitrogen in the soil. Its nitrogen-fixing abilities (which increases soil nitrogen) and its use as an animal feed greatly improve agricultural efficiency.

Alfalfa can be sown in spring or fall, and does best on well-drained soils with a neutral pH of 6.8 – 7.5. Alfalfa requires sustained levels of potassium and phosphorus to grow well. It is moderately sensitive to salt levels in both the soil and irrigation water, although it continues to be grown in the arid southwestern United States, where salinity is an emerging issue. Soils low in fertility should be fertilized with manure or a chemical fertilizer, but correction of pH is particularly important. Usually a seeding rate of 13 – 20 kg/hectare (12 – 25 lb/acre) is recommended, with differences based upon region, soil type, and seeding method. A nurse crop is sometimes used, particularly for spring plantings, to reduce weed problems and soil erosion, but can lead to competition for light, water and nutrients.

In most climates, alfalfa is cut three to four times a year, but it can be harvested up to 12 times per year in Arizona and southern California. Total yields are typically around 8 tonnes per hectare (4 short tons per acre) in temperate environments, but yields have been recorded up to 20 t/ha (16 short tons per acre). Yields vary with region, weather, and the crop's stage of maturity when cut. Later cuttings improve yield, but with reduced nutritional content.
Ask another question, I may be able to help!
New Topic      
Explore
Post your homework questions and get free online help from our incredible volunteers
  1000 People Browsing
Related Images
  
 228
  
 216
  
 6
Your Opinion
Which 'study break' activity do you find most distracting?
Votes: 741

Previous poll results: What's your favorite math subject?