Integrated model and field experiment to determine the optimum planting density in plastic film mulched rainfed agriculture

Zhang, Feng; Eldoma, Ibrahim M.; Li, Ming; Kong, Meng; Siddique, Kadambot H. M.; Li, Feng Min

doi:10.1016/j.agrformet.2019.01.040

Cited by 23 publications

(5 citation statements)

References 44 publications

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“…The majority of rainfall events are concentrated in the growing season (1 May to 30 September), and extreme precipitation events often occur during this period. The mean annual evaporation is about 1300 mm (Zhang et al, 2019). The soil is classified as Heima according to Calcic Kastanozem, FAO Taxonomy, with a 1.22 g cm -3 bulk density, 9% clay, 13% sand and 78% silt in 0-20 cm soil profile (Fang et al, 2017).…”

Section: Experimental Sitementioning

confidence: 99%

Legacy effects of precipitation amount and frequency on the aboveground plant biomass of a semi-arid grassland

Gong

Zhao

et al. 2020

Science of The Total Environment

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Section: Experimental Sitementioning

confidence: 99%

Legacy effects of precipitation amount and frequency on the aboveground plant biomass of a semi-arid grassland

Gong

Zhao

et al. 2020

Science of The Total Environment

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“…In this study, the process‐based computer model denitrification‐decomposition (DNDC) was used to study the water, carbon, and nitrogen processes in the sacsaoul and the goji berry ecosystems. The DNDC model has been widely applied across the globe to study land management impacts on C and N change (Gilhespy et al, 2014; Giltrap et al, 2010; Qin et al, 2022; Zhang et al, 2017, 2018, 2019). The model contains six sub‐models: the soil climate, crop growth, decomposition, nitrification, denitrification, and fermentation sub‐models.…”

Section: Methodsmentioning

confidence: 99%

Impact of planting Lycium barbarum L. on the carbon–land–water nexus of a Haloxylon ammodendron nature reserve in the Qaidam basin, China

et al. 2022

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Desert ecosystems are an important component of terrestrial ecosystems and land use change directly affects their composition and function. However, there have been few studies on how land use change impacts the carbon-land-water nexus in desert ecosystems. We studied the effects of replacing sacsaoul (Haloxylon ammodendron), a typical natural vegetation in the Qaidam basin, China, with artificially planted goji berry (Lycium barbarum L.) using the denitrification-decomposition (DNDC) model. Our results showed that DNDC model coefficient of determination (R 2 ) and Nash-Sutcliffe modelling efficiency (NSE) both reached 0.92 for sacsaoul and goji berry, and the root mean square error (RMSE) of the simulation was 495 kg ha À1 and 116 kg ha À1 for sacsaoul and goji berry, respectively. The land use

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“…The planting densities we used did not significantly affect yield per plant, so the denser treatments resulted in a proportionately higher yield per area. Two experiments with maize in China found contradictory results: one found optimum planting density 30% higher with PFM (Liu et al, 2014), and the other found no effect (Zhang et al, 2019). In order to determine the density that would give a maximum yield per area, and see if PFM changed this, future experiments would need to use more density levels, particularly denser plantings.…”

Section: A B D C Figurementioning

confidence: 99%

Biodegradable plastic mulch films increase yield and promote nitrogen use efficiency in organic horticulture

2023

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Plastic film mulches (PFM) are used extensively due to their ability to increase yield and suppress weed emergence. Their effects on plant-soil-microbial interactions, however, are less well understood. Organic systems rely on the supply of nutrients from organic sources (e.g., manures and fertility-building leys) and where poor N availability often limits yield. The issue is compounded by horticultural crops (e.g., lettuce) with a high N demand, but which are inefficient at recovering N from soil. The effect of PFM on the mineralisation of organic fertilisers and its interaction with other agronomic factors such as planting density is also less well-researched. We hypothesised that biodegradable PFM would be a useful tool to increase the efficiency of N management in organic horticulture by increasing the supply of available N leading to increased crop N uptake and crop yield, and simultaneously reducing N losses during the growing season. We conducted two field experiments under a temperate maritime climate with lettuces grown with either conventional (LDPE) PFM or a polylactic acid-based biodegradable PFM alongside un-mulched controls. The first experiment involved black or white coloured PFMs and two planting densities while the second experiment involved treatments with and without addition of poultry manure. Overall, yields were increased by 39% in both experiments with PFM, while soil mineral N concentrations were up to 5 times higher with PFM than without. Measurements of soil organic matter (SOM) turnover (Tea Bag Index) and soil CO2 efflux indicated a more rapid decay of SOM in the presence of the PFM. The use of PFM also promoted N use efficiency (NUE) by 300% in the presence of poultry manure. Denser planting with PFM resulted in proportionately higher yields. Higher yield and higher N concentrations (5-10%) in crop tissue in mulched plots resulted in higher total N uptake, however, total N uptake was low compared to soil concentrations: mulching with biodegradable PFM resulted in higher residual mineral N than un-mulched plots (77-147 mg kg-1 vs. 19 -70 mg kg-1). Our results are consistent with reduced N losses to the environment during the growing season and increased mineralisation under PFM. In conclusion, our findings support the adoption of PFM for organic horticulture and show that biodegradable PFM perform similarly to LDPE-based PFMs.

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Integrated model and field experiment to determine the optimum planting density in plastic film mulched rainfed agriculture

Cited by 23 publications

References 44 publications

Legacy effects of precipitation amount and frequency on the aboveground plant biomass of a semi-arid grassland

Legacy effects of precipitation amount and frequency on the aboveground plant biomass of a semi-arid grassland

Impact of planting Lycium barbarum L. on the carbon–land–water nexus of a Haloxylon ammodendron nature reserve in the Qaidam basin, China

Biodegradable plastic mulch films increase yield and promote nitrogen use efficiency in organic horticulture

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