Abstract
Abstract Two field experiments were carried out at Sakha Agricultural Research Station during the 1988 and 1989 seasons to determine the effect of irrigation regime, nitrogen (N) fertilization, and their interactions on N content of both cotton plant and soil as well as N losses into groundwater. The data showed that irrigation at 14 days after the wilting leaves had a negative effect on growth, boll weight, and nutrient concentrations [N, phosphorus (P), potassium (K)]. Irrigation at the initial sign of wilting had a positive effect. It was found that increasing N application rates increased dry matter and N uptake by the plant. The highest rate (traditional) of 70 kg N/Fad gave the highest growth (plant dry weight) and N uptake by the cotton plant. Examination of the interactions between irrigation and N treatments revealed that the highest boll weight was due to application of irrigation at the initial sign of wilting and N fertilization at the rate of 70 kg N/Fad (166.7 kg/ha, 1 Fad=0.42 ha).
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Claims 5
Claim · model-written summary
Irrigation 14 days after leaf wilting reduced cotton growth, boll weight, and nutrient concentrations.
- Taxon
- cotton
Gossypium hirsutumt0 - Treatment
- irrigation at 14 days after the wilting leavese0
- Outcome
- growth, boll weight, and nutrient concentrations [N, phosphorus (P), potassium (K)]e0
- Direction
- negative effecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“irrigation at 14 days after the wilting leaves had a negative effect on growth, boll weight, and nutrient concentrations [N, phosphorus (P), potassium (K)]”
t0“cotton”
Claim · model-written summary
Irrigation at initial wilting had a positive effect on cotton.
- Taxon
- cottonGossypium hirsutumt0
- Treatment
- Irrigation at the initial sign of wiltinge0
- Outcome
- positive effecte0
- Direction
- positivee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Irrigation at the initial sign of wilting had a positive effect”
t0“cotton”
Claim · model-written summary
Higher nitrogen application increased cotton dry matter and nitrogen uptake.
- Taxon
- cottonGossypium hirsutumt0
- Treatment
- increasing N application ratese0
- Outcome
- dry matter and N uptakee0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“increasing N application rates increased dry matter and N uptake by the plant”
t0“cotton”
Claim · model-written summary
The 70 kg N/Fad rate produced the highest cotton dry weight and nitrogen uptake.
- Taxon
- cottonGossypium hirsutume0
- Treatment
- 70 kg N/Fade0
- Outcome
- growth (plant dry weight) and N uptakee0
- Direction
- higheste0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The highest rate (traditional) of 70 kg N/Fad gave the highest growth (plant dry weight) and N uptake by the cotton plant”
Claim · model-written summary
Irrigation at initial wilting combined with 70 kg N/Fad produced the highest boll weight.
- Taxon
- cottonGossypium hirsutumt0
- Treatment
- irrigation at the initial sign of wilting and N fertilization at the rate of 70 kg N/Fade0
- Outcome
- boll weighte0
- Direction
- higheste0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the highest boll weight was due to application of irrigation at the initial sign of wilting and N fertilization at the rate of 70 kg N/Fad”
t0“cotton”
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