|
Showing 1 - 1 of
1 matches in All Departments
Adequate nitrogen fertilization is needed to obtain maximum crop
yields. Without sufficient nitrogen available to the plant, other
inputs are wasted. There are great differences between developed
and develop ing areas of the world with regard to
nitrogen-fertilizer production and application, resulting in
serious food deficits in some of the most needy areas. Although
nitrogen fertilizer is an inexpensive input in comparison to the
resulting yield increases, chemical fertilizers must be purchased
and do represent a direct cash outlay, sometimes the only cash
require ment for the peasant farmer, often an insurmountable
obstacle in subsistence farming situations. If present economic
trends continue, poor farmers may find it increasingly more
difficult to pay for nitrogen fertilizers. Biological nitrogen
fixation offers the most promising alternative or supplement to
chemical nitrogen fertilizers. Furthermore, nitrogen fixation does
not present any hazard to the environment which may be the case
with excessive application of chemical nitrogen fertilizers. It is
there fore of utmost importance to promote the use of nitrogen
fixing crops, especially grain legumes which are also an important
source of dietary protein. Although legumes only account for some
9% of the combined world dry matter yield of cereals and legumes,
they con stitute as much as 24% of the total protein yield of these
crops because of the high protein content in legumes.
|
You may like...
Loot
Nadine Gordimer
Paperback
(2)
R398
R330
Discovery Miles 3 300
Loot
Nadine Gordimer
Paperback
(2)
R398
R330
Discovery Miles 3 300
|
Email address subscribed successfully.
A activation email has been sent to you.
Please click the link in that email to activate your subscription.