Abstract
Irrigation is the only source of soil water in greenhouse cultivation. The objective of this study is to illustrate the differences in soil organic nitrogen mineralisation caused by irrigation volume and frequency, and provide theoretical bases for the process of nitrogen transformation and nitrogen fertiliser application under different irrigation methods. The soil nitrogen mineralisation process was studied by the long-term intermittent leaching aerobic incubation method which was used by Standford and Smith in 1972. Parameters of soil nitrogen mineralisation potential (N0), the mineralisation rate constant (k) and half-life period (t1/2) in different soil layers were studied in greenhouse tomato cultivation for seven years, irrigated in three ways: subsurface irrigation (SI), drip irrigation (DI) and furrow irrigation (FI). The results showed that the first-order reaction kinetic model can be used to predict the soil organic nitrogen mineralisation characteristics in a greenhouse. There were five soil layers (0–10, 10–20, 20–30, 30–40 and 40–50 cm) in this study. In 0–20 cm soil layers, the N0 value of DI was highest, then FI, and SI was lowest. Apart from 10 to 20 cm soil layer, the k values of SI and DI were higher than for FI in other soil layers, while the t1/2 value of FI was highest, then DI, and t1/2 of SI was the lowest. The main reasons were that large amounts of water in FI would lead to increased soil bulk density and reduced soil temperature. DI with property ratio of the temperature and moisture was beneficial to organic nitrogen mineralisation. For SI, due to the overall upward movement of water for many years, nitrate accumulated and the pH value decreased in 0–20 cm soil layers. DI could increase the proportion of N0 value to the soil's total nitrogen. Therefore, according to the results of this study, DI gives the best effect on soil fertility, followed by SI and then by FI.
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Claims 11
Claim · model-written summary
A first-order model predicted soil nitrogen mineralisation characteristics.
- Outcome
- soil organic nitrogen mineralisation characteristicse0
Not reportedTaxonComparatorValue
Verbatim
e0“the first-order reaction kinetic model can be used to predict the soil organic nitrogen mineralisation characteristics in a greenhouse”
Claim · model-written summary
Drip irrigation had the highest N0 in the upper soil layers, followed by furrow and subsurface irrigation.
Solanum lycopersicumNot reportedOrgan / stage
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In 0–20 cm soil layers, the N0 value of DI was highest, then FI, and SI was lowest”
e1“greenhouse tomato cultivation”
Claim · model-written summary
SI and DI had higher k values than FI except at 10 to 20 cm.
Not reportedTaxon
Verbatim
e0“Apart from 10 to 20 cm soil layer, the k values of SI and DI were higher than for FI in other soil layers”
Claim · model-written summary
FI had the highest t1/2, followed by DI and SI.
Not reportedTaxon
Verbatim
e0“the t1/2 value of FI was highest, then DI, and t1/2 of SI was the lowest”
Claim · model-written summary
FI was associated with increased soil bulk density.
Not reportedTaxon
Verbatim
e0“large amounts of water in FI would lead to increased soil bulk density and reduced soil temperature”
Claim · model-written summary
FI was associated with reduced soil temperature.
Not reportedTaxon
Verbatim
e0“large amounts of water in FI would lead to increased soil bulk density and reduced soil temperature”
Claim · model-written summary
DI favored organic nitrogen mineralisation.
- Treatment
- DIe0
- Outcome
- organic nitrogen mineralisatione0
- Qualifier
- property ratio of the temperature and moisturee0
Not reportedTaxon
Verbatim
e0“DI with property ratio of the temperature and moisture was beneficial to organic nitrogen mineralisation”
Claim · model-written summary
SI led to nitrate accumulation in the upper soil.
Not reportedTaxon
Verbatim
e0“For SI, due to the overall upward movement of water for many years, nitrate accumulated and the pH value decreased in 0–20 cm soil layers”
Claim · model-written summary
SI decreased pH in the upper soil.
Not reportedTaxon
Verbatim
e0“For SI, due to the overall upward movement of water for many years, nitrate accumulated and the pH value decreased in 0–20 cm soil layers”
Claim · model-written summary
DI increased the proportion of N0 to total soil nitrogen.
Not reportedTaxonComparator
Verbatim
e0“DI could increase the proportion of N0 value to the soil's total nitrogen”
Claim · model-written summary
DI gave the best soil fertility effect, followed by SI and FI.
Not reportedTaxon
Verbatim
e0“DI gives the best effect on soil fertility, followed by SI and then by FI”