Effects of ditch-buried straw return on water percolation, nitrogen leaching and crop yields in a rice-wheat rotation system

2015 ◽  
Vol 96 (4) ◽  
pp. 1141-1149 ◽  
Author(s):  
Haishui Yang ◽  
Mingmin Xu ◽  
Roger T Koide ◽  
Qian Liu ◽  
Yajun Dai ◽  
...  
Keyword(s):  
Crop Yields ◽  
Nitrogen Leaching ◽  
Rotation System ◽  
Water Percolation ◽  
Straw Return

scholarly journals Response of Vertical Migration and Leaching of Nitrogen in Percolation Water of Paddy Fields under Water-Saving Irrigation and Straw Return Conditions

Water ◽  
2019 ◽  
Vol 11 (4) ◽  
pp. 868 ◽  
Author(s):  
Chengxin Zheng ◽  
Zhanyu Zhang ◽  
Yunyu Wu ◽  
Richwell Mwiya
Keyword(s):  
Vertical Migration ◽  
Growth Stage ◽  
Nitrogen Leaching ◽  
Water Saving ◽  
Paddy Fields ◽  
N Leaching ◽  
Leaching Losses ◽  
Leaching Loss ◽  
Straw Return ◽  
Percolation Water

The use of water-saving irrigation techniques has been encouraged in rice fields in response to irrigation water scarcity. Straw return is an important means of straw reuse. However, the environmental impact of this technology, e.g., nitrogen leaching loss, must be further explored. A two-year (2017–2018) experiment was conducted to investigate the vertical migration and leaching of nitrogen in paddy fields under water-saving and straw return conditions. Treatments included traditional flood irrigation (FI) and two water-saving irrigation regimes: rain-catching and controlled irrigation (RC-CI) and drought planting with straw mulching (DP-SM). RC-CI and DP-SM both significantly decreased the irrigation input compared with FI. RC-CI increased the rice yield by 8.23%~12.26%, while DP-SM decreased it by 8.98%~15.24% compared with FI. NH4+-N was the main form of the nitrogen leaching loss in percolation water, occupying 49.06%~50.97% of TN leaching losses. The NH4+-N and TN concentration showed a decreasing trend from top to bottom in soil water of 0~54 cm depth, while the concentration of NO3−-N presented the opposite behavior. The TN and NH4+-N concentrations in percolation water of RC-CI during most of the rice growth stage were the highest among treatments in both years, and DP-SM showed a trend of decreasing TN and NH4+-N concentrations. The NO3−-N concentrations in percolation water showed a regular pattern of DP-SM > RC-CI > FI during most of the rice growth stage. RC-CI and DP-SM remarkably reduced the amount of N leaching losses compared to FI as a result of the significant decrease of percolation water volumes. The tillering and jointing-booting stages were the two critical periods of N leaching (accounted for 74.85%~86.26% of N leaching losses). Great promotion potential of RC-CI and DP-SM exists in the lower reaches of the Yangtze River, China, and DP-SM needs to be further optimized.

scholarly journals Soil carbon management in large-scale Earth system modelling: implications for crop yields and nitrogen leaching

2015 ◽  
Vol 6 (2) ◽  
pp. 745-768 ◽  
Author(s):  
S. Olin ◽  
M. Lindeskog ◽  
T. A. M. Pugh ◽  
G. Schurgers ◽  
D. Wårlind ◽  
...  
Keyword(s):  
Land Use ◽  
Ecosystem Services ◽  
Carbon Sequestration ◽  
Soil Carbon ◽  
Carbon Storage ◽  
Crop Yields ◽  
Nitrogen Leaching ◽  
Future Climate Change ◽  
Climate Change Scenarios ◽  
Trade Offs

Abstract. Croplands are vital ecosystems for human well-being and provide important ecosystem services such as crop yields, retention of nitrogen and carbon storage. On large (regional to global)-scale levels, assessment of how these different services will vary in space and time, especially in response to cropland management, are scarce. We explore cropland management alternatives and the effect these can have on future C and N pools and fluxes using the land-use-enabled dynamic vegetation model LPJ-GUESS (Lund–Potsdam–Jena General Ecosystem Simulator). Simulated crop production, cropland carbon storage, carbon sequestration and nitrogen leaching from croplands are evaluated and discussed. Compared to the version of LPJ-GUESS that does not include land-use dynamics, estimates of soil carbon stocks and nitrogen leaching from terrestrial to aquatic ecosystems were improved. Our model experiments allow us to investigate trade-offs between these ecosystem services that can be provided from agricultural fields. These trade-offs are evaluated for current land use and climate and further explored for future conditions within the two future climate change scenarios, RCP (Representative Concentration Pathway) 2.6 and 8.5. Our results show that the potential for carbon sequestration due to typical cropland management practices such as no-till management and cover crops proposed in previous studies is not realised, globally or over larger climatic regions. Our results highlight important considerations to be made when modelling C–N interactions in agricultural ecosystems under future environmental change and the effects these have on terrestrial biogeochemical cycles.

Can reducing tillage and increasing crop diversity benefit grain and forage production?

2017 ◽  
Vol 33 (5) ◽  
pp. 406-417 ◽  
Author(s):  
Sharon L. Weyers ◽  
David W. Archer ◽  
Frank Forcella ◽  
Russ Gesch ◽  
Jane M.F. Johnson
Keyword(s):  
Crop Yields ◽  
Reduced Tillage ◽  
Forage Production ◽  
Weed Seed ◽  
Upper Midwest ◽  
System Productivity ◽  
Soil C ◽  
Rotation System ◽  
Strip Tillage ◽  
And Function

AbstractBenefits of reduced tillage and diverse crop rotations include reversing soil C loss, and improving soil quality and function. However, adoption of these strategies is lagging, particularly in the Upper Midwest, due to a perception that reduced tillage lowers crop yields. Therefore, an 8-year comparison of these conservation systems with a conventional, tilled, 2-year rotation system was conducted to evaluate effects on yields, system productivity (measured with potential gross returns) and weed seed densities. This study compared conventional moldboard plow + chisel till (CT) to reduced strip-tillage + no-tillage (ST), each with a 2-year (2y) or 4-year (4y) crop rotation, abbreviated as CT-2y, CT-4y, ST-2y and ST-4y. The 2y rotation was corn (Zea maysL.) and soybean (Glycine max[L.] Merr.); the 4y rotation was corn, soybean, spring wheat (Triticum aestivumL.) underseeded with alfalfa (Medicago sativaL.) and alfalfa. Only corn grain was significantly influenced by tillage strategy; CT systems yielded more than ST systems, regardless of rotation. Soybean grain yields were similar among CT-2y, CT-4y, ST-4y and lowest in the ST-2y. Yields of wheat and alfalfa were the same under both tillage strategies. Weed seed densities were higher in wheat and alfalfa, followed by corn then soybean, but were not influenced by tillage or rotation, nor universally negatively correlated to yield. Due to greater corn yields, overall system productivity was highest in CT-2y, the same between CT-4y and ST-2y, and lowest in ST-4y. Within years, productivity of CT-2y was different from only one other system at a time in 3 of 8 years and had the same productivity as all systems in another 3 of 8 years. Additionally, the similarity of productivity among three of four systems in 6 of 8 years indicated reduced tillage and diverse rotations have potential for adoption. Results support the need for research on a rotational tillage strategy, i.e., moldboard plowing before corn, to improve overall productivity if using ST before soybean, wheat and alfalfa.

scholarly journals Long-term effects of straw and straw-derived biochar on soil aggregation and fungal community in a rice–wheat rotation system

PeerJ ◽  
2019 ◽  
Vol 6 ◽  
pp. e6171 ◽  
Author(s):  
Naling Bai ◽  
Hanlin Zhang ◽  
Shuangxi Li ◽  
Xianqing Zheng ◽  
Juanqin Zhang ◽  
...  
Keyword(s):  
Community Structure ◽  
Fungal Community ◽  
Soil Samples ◽  
Soil Aggregation ◽  
Inorganic Fertilizer ◽  
Sequencing Analysis ◽  
Fungal Community Structure ◽  
Rotation System ◽  
Straw Return

Background Soil aggregation is fundamental for soil functioning and agricultural productivity. Aggregate formation depends on microbial activity influencing the production of exudates and hyphae, which in turn act as binding materials. Fungi are also important for improving soil quality and promoting plant growth in a symbiotic manner. There is a scarcity of findings comparing the long-term impacts of different yearly double-crop straw return modes (e.g., straw return to the field and straw-derived biochar return to the field) on soil aggregation and fungal community structure in rice–wheat rotation systems. Methods The effects of 6-year continuous straw and straw-derived biochar amendment on soil physicochemical properties and the fungal community were evaluated in an intensively managed crop rotation system (rice–wheat). Soil samples of different aggregates (macroaggregates, microaggregates, and silt clay) from four different fertilization regimes (control, CK; traditional inorganic fertilization, CF; straw returned to field, CS; straw-derived biochar addition, CB) were obtained, and Illumina MiSeq sequencing analysis of the fungal internal transcribed spacer gene was performed. Results Compared to CF, CS and CB enhanced soil organic carbon, total nitrogen, and aggregation in 0–20 and 20–40 cm soil, with CB exhibiting a stronger effect. Additionally, agrowaste addition increased the mean weight diameter and the geometric diameter and decreased the fractal dimension (p < 0.05). Principal coordinates analysis indicated that fertilization management affected fungal community structure and aggregation distribution. In addition, CS increased fungal community richness and diversity, compared to CK, CB decreased these aspects. Ascomycota, unclassified_k_Fungi, and Basidiomycota were the dominant phyla in all soil samples. At the genus level, CB clearly increased fungi decomposing biosolids (Articulospora in macroaggregates in 0–20 cm soil and Neurospora in macroaggregates in 20–40 cm soil); decreased pathogenic fungi (Monographella in macroaggregates and Gibberella in microaggregates in 0–20 cm soil) and CO2-emission-related fungi (Pyrenochaetopsis in microaggregates and silt clay in 0–40 cm soil) (p < 0.05). Straw and biochar with inorganic fertilizer counteracted some of the adverse effects of the inorganic fertilizer with biochar showing better effects than straw.

Composted manure and straw amendments in wheat of a rice–wheat rotation system alter weed richness and abundance

Weed Science ◽  
2019 ◽  
Vol 67 (3) ◽  
pp. 318-326
Author(s):  
Haiyan Zhang ◽  
Yicheng Sun ◽  
Yong Li ◽  
Guojun Sun ◽  
Fang Yuan ◽  
...  
Keyword(s):  
Fertilizer Application ◽  
Chemical Fertilizer ◽  
Pig Manure ◽  
Weed Species ◽  
Weed Density ◽  
Rotation System ◽  
Weed Communities ◽  
Agricultural Weed ◽  
Straw Return ◽  
The Impact

AbstractIn a rice (Oryza sativa L.)–wheat (Triticum aestivumL.) rotation system, a study was conducted to determine the effects of different fertilization regimens (no fertilization, replacement of a portion of chemical fertilizer with composted pig manure, chemical fertilizer only, and straw return combined with chemical fertilizer) on the weed communities and wheat yields after 4 and 5 yr. The impact of the long-term recurrent fertilization regimen initiated in 2010 on the composition and diversity of weed communities and the impact of the components and total amount of fertilizer on wheat yields were assessed in 2014 and 2015. Totals of 19 and 16 weed species were identified in experimental wheat fields in 2014 and 2015, respectively, but the occurrence of weed species varied according to the fertilization regimen. American sloughgrass [Beckmannia syzigachne(Steud.) Fernald], water starwort [Myosoton aquaticum(L.) Moench], and lyrate hemistepta (Hemistepta lyrataBunge.) were adapted to all fertilization treatments and were the dominant weed species in the experimental wheat fields. The greatest number of weed species were observed under the no-fertilization treatment, in which 40% of the weed community was composed of broadleaf weeds and the lowest wheat yields were obtained. With fertilizer application, the number of weed species was reduced, the height of weeds increased significantly, the density of broadleaf weeds was significantly reduced, the biodiversity indices of weed communities decreased significantly, and higher wheat yields were obtained. Only the chemical fertilizer plus composted pig manure treatment and the chemical fertilizer–only treatment increased the density of grassy weeds and the total weed community density. The treatment with chemical fertilizer only also resulted in the highest density ofB. syzigachne. Rice straw return combined with chemical fertilizer yielded the lowest total weed density, which suggests that it inhibited occurrence of weeds. The different fertilizer regimens not only affected the weed species composition, distribution, and diversity, but also the weed density. Our study provides new information from a rice–wheat rotation system on the relationship between soil amendments and agricultural weed infestation.

Long-term effects of controlled release urea application on crop yields and soil fertility under rice-oilseed rape rotation system

2015 ◽  
Vol 184 ◽  
pp. 65-73 ◽  
Author(s):  
Jibiao Geng ◽  
Yunbao Sun ◽  
Min Zhang ◽  
Chengliang Li ◽  
Yuechao Yang ◽  
...  
Keyword(s):  
Controlled Release ◽  
Soil Fertility ◽  
Oilseed Rape ◽  
Crop Yields ◽  
Long Term Effects ◽  
Rotation System ◽  
Controlled Release Urea

scholarly journals Soil carbon management in large-scale Earth system modelling: implications for crop yields and nitrogen leaching

2015 ◽  
Vol 6 (1) ◽  
pp. 1047-1100 ◽  
Author(s):  
S. Olin ◽  
M. Lindeskog ◽  
T. A. M. Pugh ◽  
G. Schurgers ◽  
D. Wårlind ◽  
...  
Keyword(s):  
Land Use ◽  
Carbon Sequestration ◽  
Soil Carbon ◽  
Carbon Storage ◽  
Crop Yields ◽  
Nitrogen Leaching ◽  
Future Climate Change ◽  
System Modelling ◽  
Climate Change Scenarios ◽  
Trade Offs

Abstract. We explore cropland management alternatives and the effect these can have on future C and N pools and fluxes using the land use-enabled dynamic vegetation model LPJ-GUESS. Simulated crop production, cropland carbon storage, carbon sequestration and nitrogen leaching from croplands are evaluated and discussed. Compared to the version of LPJ-GUESS that does not include land use dynamics, estimates of soil carbon stocks and nitrogen leaching from terrestrial to aquatic ecosystems were improved. We explore trade-offs between important ecosystem services that can be provided from agricultural fields such as crop yields, retention of nitrogen and carbon storage. These trade-offs are evaluated for current land use and climate and further explored for future conditions within the two future climate change scenarios, RCP 2.6 and 8.5. Our results show that the potential for carbon sequestration due to typical cropland management practices such as no-till and cover-crops proposed in literature is not realised, globally or over larger climatic regions. Our results highlight important considerations to be made when modelling C–N interactions in agricultural ecosystems under future environmental change, and the effects these have on terrestrial biogeochemical cycles.

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