Abstract
Excess application with the poor efficiency of fertilizers is one of the major problems confronting the sustainable agricultural development. Whereas, loss of N and P nutrients from farmlands to surface waters is considered as one of the major sources inducing eutrophication. In order to work out a minimum fertilizer application rate for both keeping conventional yield and reducing nutrient loading of non point source pollution, an experiment of formulated fertilization scheme on rice at different rates and nutrient ratios by incorporating the soil supply potential was conducted in a paddy soil Wunitu in Kunshan City, Suzhou. The soil nutrient can supply a yield at 6.75 t/hm2 at least for one cropping season. Among the fertilization treatments, a maximum yield of 9.79 t/hm2 was obtained at fertilization (N + P) rate of 300 kg/hm2kg N and P at a ratio of N to P being 3:2 or 1:1. However, with much lower fertilization (N + P) rate at 240 kg/hm2 with the same ratio a high yield of 9.69 t/hm2 was reached. The fertilizer efficiency of the later was 3 times as that of the former rate. Thus, a economical and environmentally sound mode of fertilization in such paddy soils as total N and P 240 kg/hm2, with N:P:Kratio being 3:2:0 or 1:1:0 was developed. Further study would be directed to a innovation of combination of reducing fertilization rate with rotated fertilization for alternative crops.
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Claims 5
Claim · model-written summary
Soil nutrient supply supported rice yield of at least 6.75 t/hm2 for one crop.
- Taxon
- rice
Oryza sativat0 - Outcome
- yielde0
- Value
- 6.75 t/hm2e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The soil nutrient can supply a yield at 6.75 t/hm2 at least for one cropping season.”
t0“rice production system”
Claim · model-written summary
Rice maximum yield was 9.79 t/hm2 at 300 kg/hm2 N and P with N:P of 3:2 or 1:1.
- Taxon
- riceOryza sativat0
- Treatment
- fertilization (N + P) rate of 300 kg/hm2kg N and Pe0
- Outcome
- yielde0
- Direction
- maximume0
- Value
- 9.79 t/hm2e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a maximum yield of 9.79 t/hm2 was obtained at fertilization (N + P) rate of 300 kg/hm2kg N and P at a ratio of N to P being 3:2 or 1:1.”
t0“rice production system”
Claim · model-written summary
Rice yielded 9.69 t/hm2 at 240 kg/hm2 N and P with the same ratio.
- Taxon
- riceOryza sativat0
- Treatment
- fertilization (N + P) rate at 240 kg/hm2e0
- Outcome
- yielde0
- Direction
- highe0
- Value
- 9.69 t/hm2e0
- Comparator
- same ratioe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“with much lower fertilization (N + P) rate at 240 kg/hm2 with the same ratio a high yield of 9.69 t/hm2 was reached.”
t0“rice production system”
Claim · model-written summary
Fertilizer efficiency at 240 kg/hm2 was three times that at 300 kg/hm2.
- Treatment
- fertilization (N + P) rate at 240 kg/hm2e1
- Outcome
- fertilizer efficiencye0
- Direction
- 3 timese0
- Value
- 3 timese0
- Comparator
- fertilization (N + P) rate of 300 kg/hm2kg N and Pe2
Not reportedTaxon
Verbatim
e0“The fertilizer efficiency of the later was 3 times as that of the former rate.”
e1“fertilization (N + P) rate at 240 kg/hm2”
e2“fertilization (N + P) rate of 300 kg/hm2kg N and P”
Claim · model-written summary
The authors recommend 240 kg/hm2 total N and P at N:P:K ratios of 3:2:0 or 1:1:0 for such paddy soils.
- Taxon
- riceOryza sativat0
- Outcome
- mode of fertilizatione0
- Value
- 240 kg/hm2e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a economical and environmentally sound mode of fertilization in such paddy soils as total N and P 240 kg/hm2, with N:P:Kratio being 3:2:0 or 1:1:0 was developed.”
t0“rice production system”
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