rainfall and irrigation is smaller

rainfall and irrigation is smaller than the amount
lost from leaching. For a particular field, we
can assume that nutrient losses from seepage
are similar to nutrient inputs from seepage
coming from neighboring fields.
A simple partial K, P, or S budget can be
estimated as:
Partial input - output budget = M - C
= (fertilizer input + straw retained) - total
plant uptake
Table 1 shows an estimated average nutrient
budget for an irrigated rice crop in Asia. Data
used to calculate fertilizer nutrient inputs and
crop nutrient removal are based on
measurements taken in farmers’ fields. In this
example, organic manures were not used to
reflect the general trend for their replacement
by mineral fertilizer use. These calculations
underline the importance of straw
management in the nutrient balance. This is
particularly important for K for which relatively
small amounts of fertilizer nutrients are added
and large amounts of nutrient may be removed
with the straw.
Further reading
Abedin Mian MJ, Blume HP, Bhuiya ZH, Eaqub
M. 1991. Water and nutrient dynamics of a
paddy soil of Bangladesh. Z. Pfl.-Ern. Bodenk.
154:93–99.
App A, Santiago T, Daez C, Menguito C,
Ventura WB, Tirol A, Po J, Watanabe I, De
Datta SK, Roger PA. 1984. Estimation of the
nitrogen balance for irrigated rice and the
contribution of phototrophic nitrogen fixation.
Field Crops Res. 9:17–27.
Cassman KG, Peng S, Olk DC, Ladha JK,
Reichardt W, Dobermann A, Singh U. 1998.
Opportunities for increased nitrogen use
efficiency from improved resource
management in irrigated rice systems. Field
Crops Res. 56:7–38.
De Datta SK, Buresh RJ, Obcemea WN,
Castillo EG. 1990. Nitrogen-15 balances and
nitrogen fertilizer use efficiency in upland rice.
Fert. Res. 26:179–187.

ผลลัพธ์ (อังกฤษ) 3:

rainfall and irrigation is smaller than the amount lost from leaching
.For a particular field, we can assume that

nutrient losses from seepage are similar to nutrient inputs from seepage coming from neighboring fields
.
A simple partial K, P, or S
budget can be estimated as:
Partial input-output budget=M - C
= (fertilizer input straw retained) - Total plant uptake

1 shows an estimated average nutrient Table
budget for an irrigated rice crop in Asia.Data
used to calculate fertilizer nutrient inputs and crop nutrient removal

are based on measurements taken in farmers' fields. In
this example, organic manures were not used to reflect the general trend

for their replacement by mineral fertilizer use. These calculations underline the importance of straw

the nutrient balance in management. This is particularly important for K

for which relatively small amounts of fertilizer nutrients are added
and large amounts of nutrient may be removed with the straw
.

reading Further Abedin Mian MJ, Blume HP, Bhuiya ZH, Eaqub
M. 1991. Water and nutrient dynamics of a paddy soil of
Bangladesh.Z.Pfl.- Ern.Bodenk.
154: 93 - 99.
App A, Santiago T, Daez C,Menguito C,
Ventura WB, Tirol A, Po J, Watanabe I, De
Datta SK, Roger PA. 1984. Estimation
of the nitrogen balance for irrigated rice and the contribution of phototrophic
nitrogen fixation.
Field Crops Res.9:17 - 27.
Cassman KG, Peng S, Olk DC, Ladha JK,
Reichardt W, Dobermann A, Singh U. 1998.

Opportunities for increased nitrogen use efficiency from improved resource
management in irrigated rice systems. Field
Crops Res. 56:7-38.
De Datta SK, Buresh RJ, Obcemea WN,
Castillo EG. 1990. Nitrogen - 15 balances and
nitrogen fertilizer use efficiency in upland rice.
Fert.Res. 26:179 - 187.