Abstract
Understanding water and N transport through the soil profile is important for efficient irrigation and nutrient management to minimize nitrate leaching to the groundwater, and to promote agricultural sustainable development in desert oases. In this study, a process-based water and nitrogen management model (WNMM) was used to simulate soil water movement, nitrate transport, and crop growth (maize [Zea mays L.]) under desert oasis conditions in northwestern China. The model was calibrated and validated with a field experiment. The model simulation results showed that about 35% of total water input and 58% of the total N input were leached to <1.8 m depth under traditional management practice. Excessive irrigation and N fertilizer application, high nitrate concentration in the irrigation water, together with the sandy soil texture, resulted in large nitrate leaching. Nitrate leaching was significantly reduced under the improved management practice suggested by farm extension personnel; however, the water and nitrate inputs still far exceeded the crop requirements. More than 1700 scenarios combining various types of irrigation and fertilizer practices were simulated. Quantitative analysis was conducted to obtain the best management practices (BMPs) with simultaneous consideration of crop yield, water use efficiency, fertilizer N use efficiency, and nitrate leaching. The results indicated that the BMPs under the specific desert oasis conditions are to irrigate the maize with 600 mm of water in eight times with a single fertilizer application at a rate of 75 kg N ha(-1).
Abstract from the paper’s OpenAlex record, shown for indexing and research. Copyright remains with the authors or the publisher. Read at the source ↗
The text the model read, with the source record’s inline markup (italics, sub- and superscripts) rendered and its character entities decoded; quote offsets refer to the raw text.
Claims 6
Claim · model-written summary
Under traditional management about 35% of total water input was leached below 1.8 m depth in the simulation.
- Treatment
- traditional management practicee2
- Outcome
- total water inpute2
- Value
- 35%e2
- Qualifier
- leached to <1.8 m depthe2
- Setting
- desert oasis conditions in northwestern Chinae1
Zea maysOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“crop growth (maize [Zea mays L.]) under desert oasis conditions in northwestern China”
e2“about 35% of total water input and 58% of the total N input were leached to <1.8 m depth under traditional management practice”
Claim · model-written summary
Under traditional management about 58% of total N input was leached below 1.8 m depth in the simulation.
- Treatment
- traditional management practicee2
- Outcome
- total N inpute2
- Value
- 58%e2
- Qualifier
- leached to <1.8 m depthe2
- Setting
- desert oasis conditions in northwestern Chinae1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“crop growth (maize [Zea mays L.]) under desert oasis conditions in northwestern China”
e2“about 35% of total water input and 58% of the total N input were leached to <1.8 m depth under traditional management practice”
Claim · model-written summary
The improved management practice significantly reduced nitrate leaching compared with traditional management.
- Treatment
- improved management practice suggested by farm extension personnele3
- Outcome
- Nitrate leachinge3
- Direction
- reducede3
- Comparator
- traditional management practicee2
- Setting
- desert oasis conditions in northwestern Chinae1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“crop growth (maize [Zea mays L.]) under desert oasis conditions in northwestern China”
e2“about 35% of total water input and 58% of the total N input were leached to <1.8 m depth under traditional management practice”
e3“Nitrate leaching was significantly reduced under the improved management practice suggested by farm extension personnel”
Claim · model-written summary
Under the improved practice the water and nitrate inputs still far exceeded the crop requirements of maize.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“crop growth (maize [Zea mays L.]) under desert oasis conditions in northwestern China”
e4“the water and nitrate inputs still far exceeded the crop requirements”
Claim · model-written summary
Excessive irrigation and N fertilizer application, with high nitrate in irrigation water and sandy soil, are associated with large nitrate leaching of maize.
- Treatment
- Excessive irrigation and N fertilizer applicatione5
- Outcome
- nitrate leachinge5
- Qualifier
- sandy soil texturee5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“crop growth (maize [Zea mays L.]) under desert oasis conditions in northwestern China”
e5“Excessive irrigation and N fertilizer application, high nitrate concentration in the irrigation water, together with the sandy soil texture, resulted in large nitrate leaching”
Claim · model-written summary
The best management practice for maize is to irrigate 600 mm of water in eight times with a single fertilizer application of 75 kg N ha(-1).
- Treatment
- irrigate the maize with 600 mm of water in eight timese6
- Outcome
- BMPse6
- Value
- 75 kg N ha(-1)e6
- Setting
- desert oasis conditionse6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e6“The results indicated that the BMPs under the specific desert oasis conditions are to irrigate the maize with 600 mm of water in eight times with a single fertilizer application at a rate of 75 kg N ha(-1)”
The same questions in other papers
cultivation system · nutrient: content · Zea mays (maize)Positive and negative results
13 papers in the same direction as this paper · 2 in the opposite direction
- negative
- no effect
- positive
12 papers more in this group
See all 16 papers →Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.