Abstract
Abstract. In order to explore the optimal water-nitrogen coupling modes of flue-cured tobacco under mulch drip irrigation, a drip irrigation experiment was carried out under the lysimeter. Three irrigation levels and three nitrogen levels were set and nine different water-nitrogen coupling treatments were carried out. effects of water-nitrogen coupling on accumulation and distribution of dry matter, yield and water use efficiency of flue-cured tobacco.The results showed that the accumulation of dry matter in different parts of flue-cured tobacco increased with the increase of irrigation amount, and increased with the increase of nitrogen application firstly, then decreased, excessive nitrogen application decreased the dry matter accumulation of flue-cured tobacco, the highest accumulation of dry matter was T8 with high water and middle nitrogen. The total dry matter did not changed obviously with the increase of root-shoot ratio. The proportion of leaf dry matter to total dry matter decreased with the increase of root-shoot ratio, and the decrease was more obvious. With the increase of root-shoot ratio, the proportion of dry matter distributed in the roots is constantly increasing, and the two of them showed a very significant linear positive correlation. The highest yield was T8 (500mm, 90kg/hm2) with the high water and middle nitrogen coupling, and the lowest yield of was T1 (300mm, 60kg/hm2) with the low water and low nitrogen. The highest water use efficiency was T2 (300mm, 60kg/hm2) with low water and middle nitrogen, and the lowest water use efficiency was T9 (500mm, 120kg/hm2) with high water and high nitrogen. The increase of nitrogen application is beneficial to increase the water use efficiency of flue-cured tobacco, while the water use efficiency is inversely proportional to the increase of irrigation amount, and increasing irrigation amount is not conducive to the improvement of water use efficiency. With regard to the accumulation and distribution of dry matter, yield and water use efficiency of flue-cured tobacco, 500 mm amount of irrigation combined with 90 kg/hm2 amount of nitrogen application rate is the best water-nitrogen coupling treatment. In the actual production of flue-cured tobacco, it should be balanced and coordinated the relationship between the yield, water use efficiency and water consumption, to meet the high yield conditions, to reduce the irrigation amount can reach a high yield and water saving coordinate unity.
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Claims 15
Claim · model-written summary
Dry matter accumulation in tobacco parts increased with irrigation amount.
- Taxon
- flue-cured tobaccoe0
- Treatment
- increase of irrigation amounte0
- Outcome
- accumulation of dry matter in different partse0
- Direction
- increasede0
Not reportedComparator
Verbatim
e0“the accumulation of dry matter in different parts of flue-cured tobacco increased with the increase of irrigation amount”
Claim · model-written summary
Tobacco dry matter accumulation first increased then decreased as nitrogen application increased.
- Taxon
- flue-cured tobaccot0
- Treatment
- increase of nitrogen applicatione0
- Outcome
- dry mattere1
- Direction
- increased with the increase of nitrogen application firstly, then decreasede0
Not reportedComparator
Verbatim
e0“increased with the increase of nitrogen application firstly, then decreased”
t0“flue-cured tobacco”
e1“the accumulation of dry matter in different parts of flue-cured tobacco increased with the increase of irrigation amount”
Claim · model-written summary
Excess nitrogen decreased tobacco dry matter accumulation.
- Taxon
- flue-cured tobaccoe0
- Treatment
- excessive nitrogen applicatione0
- Outcome
- dry matter accumulatione0
- Direction
- decreasede0
Not reportedComparator
Verbatim
e0“excessive nitrogen application decreased the dry matter accumulation of flue-cured tobacco”
Claim · model-written summary
High water and middle nitrogen treatment T8 had the highest tobacco dry matter accumulation.
- Taxon
- flue-cured tobaccot0
- Treatment
- T8 with high water and middle nitrogene0
- Outcome
- accumulation of dry mattere0
- Direction
- higheste0
Not reportedComparator
Verbatim
e0“the highest accumulation of dry matter was T8 with high water and middle nitrogen”
t0“flue-cured tobacco”
Claim · model-written summary
Total dry matter did not change obviously with increasing root-shoot ratio.
Verbatim
e0“The total dry matter did not changed obviously with the increase of root-shoot ratio”
t0“flue-cured tobacco”
Claim · model-written summary
The proportion of leaf dry matter decreased as root-shoot ratio increased.
Verbatim
e0“The proportion of leaf dry matter to total dry matter decreased with the increase of root-shoot ratio”
t0“flue-cured tobacco”
Claim · model-written summary
Root dry matter allocation increased with root-shoot ratio and showed a very significant positive linear correlation.
Verbatim
e0“the proportion of dry matter distributed in the roots is constantly increasing, and the two of them showed a very significant linear positive correlation”
t0“flue-cured tobacco”
e1“The total dry matter did not changed obviously with the increase of root-shoot ratio”
Claim · model-written summary
T8 with high water and middle nitrogen had the highest tobacco yield.
Not reportedComparator
Verbatim
e0“The highest yield was T8 (500mm, 90kg/hm2) with the high water and middle nitrogen coupling”
t0“flue-cured tobacco”
Claim · model-written summary
T1 with low water and low nitrogen had the lowest tobacco yield.
Not reportedComparator
Verbatim
e0“the lowest yield of was T1 (300mm, 60kg/hm2) with the low water and low nitrogen”
t0“flue-cured tobacco”
Claim · model-written summary
T2 with low water and middle nitrogen had the highest tobacco water use efficiency.
- Taxon
- flue-cured tobaccot0
- Treatment
- T2 (300mm, 60kg/hm2)e0
- Outcome
- water use efficiencye0
- Direction
- higheste0
Not reportedComparator
Verbatim
e0“The highest water use efficiency was T2 (300mm, 60kg/hm2) with low water and middle nitrogen”
t0“flue-cured tobacco”
Claim · model-written summary
T9 with high water and high nitrogen had the lowest tobacco water use efficiency.
- Taxon
- flue-cured tobaccot0
- Treatment
- T9 (500mm, 120kg/hm2)e0
- Outcome
- water use efficiencye0
- Direction
- loweste0
Not reportedComparator
Verbatim
e0“the lowest water use efficiency was T9 (500mm, 120kg/hm2) with high water and high nitrogen”
t0“flue-cured tobacco”
Claim · model-written summary
Increasing nitrogen application increased tobacco water use efficiency.
- Taxon
- flue-cured tobaccoe0
- Treatment
- increase of nitrogen applicatione0
- Outcome
- water use efficiencye0
- Direction
- increasee0
Not reportedComparator
Verbatim
e0“The increase of nitrogen application is beneficial to increase the water use efficiency of flue-cured tobacco”
Claim · model-written summary
Increasing irrigation amount decreased tobacco water use efficiency.
- Taxon
- flue-cured tobaccot0
- Treatment
- increase of irrigation amounte0
- Outcome
- water use efficiencye0
- Direction
- decreaseinferrede0
Not reportedComparator
Verbatim
e0“the water use efficiency is inversely proportional to the increase of irrigation amount”
t0“flue-cured tobacco”
Claim · model-written summary
The authors recommend 500 mm irrigation and 90 kg/hm2 nitrogen as the best coupling treatment for tobacco.
Verbatim
e0“500 mm amount of irrigation combined with 90 kg/hm2 amount of nitrogen application rate is the best water-nitrogen coupling treatment”
t0“flue-cured tobacco”
Claim · model-written summary
The authors recommend balancing tobacco yield, water use efficiency and consumption by reducing irrigation while maintaining high yield.
Verbatim
e0“to meet the high yield conditions, to reduce the irrigation amount can reach a high yield and water saving coordinate unity”
t0“flue-cured tobacco”
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