Adjusting N, K, Mg and Cu Rates for Improvement of Fertilizer N Use Efficiency in Rice Production in Malaysia
The largest rice growing area of Malaysia is located in the Muda Irrigation Scheme. Recent investigations showed that N use efficiency by rice crop is very low in many locations of this Irrigation Scheme due to Cu and Mg deficiency. It is important to increase N use efficiency in rice culture in...
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| Main Author: | |
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| Format: | Thesis |
| Language: | English English |
| Published: |
1999
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| Subjects: | |
| Online Access: | http://psasir.upm.edu.my/id/eprint/10429/1/FP_1999_7_A.pdf |
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| Summary: | The largest rice growing area of Malaysia is located in the Muda Irrigation
Scheme. Recent investigations showed that N use efficiency by rice crop is very low
in many locations of this Irrigation Scheme due to Cu and Mg deficiency. It is
important to increase N use efficiency in rice culture in order to increase yield
through better fertilizer management. Three laboratory, three greenhouse and one
field experiments were carried out to determine the possible mechanisms for
improvement of fertilizer N use efficiency in rice production. Potassium, Mg and Cu
status of different rice soils were determined. Deficiencies of K, Mg and Cu were
found in 5, 4 and 7 soils, respectively. Three laboratory experiments were carried
out on adsorption of K, Mg and Cu in different rice soils. The data indicated that
adsorption of K, Mg and Cu depends on soil pH. The first greenhouse experiment was conducted to evaluate the effects of N
and Cu fertilization on rice yield and fertilizer N use efficiency in rice culture.
Nitrogen was applied as 1 5N labelled urea. Estimated grain yield response to added
N was quadratic in nature. Copper effect was not significant on grain yield. Effects
of N and Cu were not significant on recovery (%) of fertilizer N. The second
greenhouse experiment was conducted to evaluate the effects of N and Mg
fertil ization on rice yield and fertilizer N use efficiency in rice culture. Nitrogen was
applied as 1 5N labelled urea. Grain yield increased significantly due to N and Mg
application. Fertilizer N uptake and recovery increased significantly with increasing
Mg rates. These findings suggest that there is a prospect to increase grain yield and
fertilizer N use efficiency by Mg application in Mg deficient soils. The third
greenhouse experiment was conducted to evaluate the effects of K and Mg
fertilization on yield, and K and Mg uptake by rice. Grain yield, K and Mg uptake
increased significantly due to Mg fertilization whereas the effect of K was not
significant. The field experiment was conducted to evaluate the effects Cu and Mg
application on grain yield and agronomic efficiency of added N. Grain yield and
agronomic efficiency of added N increased significantly due to Cu or Mg
application. These findings suggest that combined application of Cu and Mg both at
10 kg ha-1 along with 120 kg N ha-1 can increase grain yield of rice by 24% in soils
deficient in both Cu and Mg. |
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