Abstract
The present experiment was undertaken in order to study the N-releasing characteristics of different kinds of controlled-release urea and their effects on the sugarcane.Five treatments,viz.CK,normal urea,resin coated urea,sulfur coated urea and the mixture of the coated urea have been applied in the sugarcane field,and the fertilizer packages were buried into field at the same time.The result showed that the Elovich equation could fit the process of N releasing from resin coated urea with good results(r=0.9796**-0.9944**).It was found more N was released at the early stage,and less at a later stage.However,the wax/resin coated urea could make up the deficiency of resin coated urea.The process of N release from sulfur coated urea could be well fitted by the parabolic diffusion equation(r=0.9914**-0.9973**).The sulfur coated urea released N stably,but hardly met the requirement of sugarcane growth at the early stage.Compared with the common urea,the controlled-release urea has increased the sugarcane yield and nitrogen utilization efficiency by 5.0-11.4% and 7.5-8.2%,respectively.The different kinds of coated urea should be mixed in proper proportion in relation to the N-releasing characteristics of different controlled-release urea and the needs of sugarcane for fertilizers.It could realize balance between supply and demand for nutrient and improve the utilization efficiency of controlled-release fertilizers.
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Claims 9
Claim · model-written summary
An Elovich equation fitted nitrogen release from resin coated urea.
Verbatim
e0“the Elovich equation could fit the process of N releasing from resin coated urea with good results(r=0.9796**-0.9944**)”
t0“sugarcane”
Claim · model-written summary
Resin coated urea released more nitrogen early than later.
Verbatim
e0“It was found more N was released at the early stage,and less at a later stage.”
t0“sugarcane”
Claim · model-written summary
Wax and resin coated urea compensated for the deficiency of resin coated urea.
Verbatim
e0“the wax/resin coated urea could make up the deficiency of resin coated urea.”
t0“sugarcane”
Claim · model-written summary
A parabolic diffusion equation fitted nitrogen release from sulfur coated urea.
Verbatim
e0“The process of N release from sulfur coated urea could be well fitted by the parabolic diffusion equation(r=0.9914**-0.9973**).”
t0“sugarcane”
Claim · model-written summary
Sulfur coated urea released nitrogen steadily.
Verbatim
e0“The sulfur coated urea released N stably”
t0“sugarcane”
Claim · model-written summary
Sulfur coated urea barely met sugarcane growth requirements early.
Verbatim
e0“hardly met the requirement of sugarcane growth at the early stage.”
Claim · model-written summary
Controlled release urea increased sugarcane yield by 5.0-11.4% relative to common urea.
Verbatim
e0“Compared with the common urea,the controlled-release urea has increased the sugarcane yield and nitrogen utilization efficiency by 5.0-11.4% and 7.5-8.2%,respectively.”
Claim · model-written summary
Controlled release urea increased nitrogen use efficiency by 7.5-8.2% relative to common urea.
Verbatim
e0“Compared with the common urea,the controlled-release urea has increased the sugarcane yield and nitrogen utilization efficiency by 5.0-11.4% and 7.5-8.2%,respectively.”
Claim · model-written summary
The authors recommend mixing coated ureas in appropriate proportions according to release traits and sugarcane needs.
Verbatim
e0“The different kinds of coated urea should be mixed in proper proportion in relation to the N-releasing characteristics of different controlled-release urea and the needs of sugarcane for fertilizers.”
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