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Development and testing of a weather-based model to determine potential yield losses caused by potato

Alexey FILIPPOV, Maria KUZNETSOVA, Alexander ROGOZHIN, Olga IAKUSHEVA, Valentina DEMIDOVA, Natalia STATSYUK

Frontiers of Agricultural Science and Engineering 2018, Volume 5, Issue 4,   Pages 462-468 doi: 10.15302/J-FASE-2018239

Abstract: To minimize yield losses, various protective measures are used including fungicide application.blight development in an experimental potato field recorded over 30 seasons, a simulator to forecast yieldlosses caused by the disease was developed based on the number of 5-d periods favorable for reinfectionThe average difference between the calculated and real yield losses did not exceed 5%.Using the simulator and weather data for a period of 2007-2017, yield losses were calculated for several

Keywords： potato     late blight     Phytophthora infestans     yield losses     retrospective analysis     mathematical model    

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CLIMATE-CHANGE-INDUCED TEMPORAL VARIATION IN PRECIPITATION INCREASES NITROGEN LOSSES FROM INTENSIVE CROPPING

Frontiers of Agricultural Science and Engineering 2022, Volume 9, Issue 3,   Pages 457-464 doi: 10.15302/J-FASE-2022452

Abstract: to evaluate how increasing temporal variability in precipitation influences crop yields and nitrogen losses

Keywords： crop yield     fertilizer timing     nitrogen loss     precipitation variability     toy model    

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Development of an analytical model to estimate the churning losses in high-speed axial piston pumps

Frontiers of Mechanical Engineering 2022, Volume 17, Issue 2, doi: 10.1007/s11465-021-0671-1

Abstract: rotating parts are fully immersed in the casing oil during operation, leading to considerable churning losses(more than 10% of total power losses) at high rotational speeds.The churning losses deserve much attention at the design stage of high-speed axial piston pumps, butaccurate analytical models are not available to estimate the drag torque associated with the churning lossesThe presented analytical model provides practical guidelines for reducing the churning losses in high-speed

Keywords： axial piston pump     rotating parts     high rotational speed     churning losses     drag torque    

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NUTRIENT USE EFFICIENCY AND LOSSES OF INDUSTRIAL FARMS AND MIXED SMALLHOLDINGS: LESSONS FROM THE NORTH

Frontiers of Agricultural Science and Engineering 2021, Volume 8, Issue 1,

Abstract: Here, we aimed to quantify nutrient flows, nutrient use efficiency, and nutrient losses in differentTo produce 1 kg N and P in animal products, nutrient losses in industrial pig farms (2.0 kg N and 1.3kg P) were lower than in mixed pig smallholdings, nutrient losses in industrial dairy farms (2.7 kgLiquid manure discharge in industrial farms was the main losses pathway in contrast to mixed smallholdings
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HOTSPOTS OF NUTRIENT LOSSES TO AIR AND WATER: AN INTEGRATED MODELING APPROACH FOR EUROPEAN RIVER BASINS

Frontiers of Agricultural Science and Engineering 2023, Volume 10, Issue 4,   Pages 579-592 doi: 10.15302/J-FASE-2023526

Abstract:

Nutrient pollution of air and water is a persistent problem in Europe. However, the pollution sources are often analyzed separately, preventing the formulation of integrative solutions. This study aimed to quantify the contribution of agriculture to air, river and coastal water pollution by nutrients. A new MARINA-Nutrients model was developed for Europe to calculate inputs of nitrogen (N) and phosphorus (P) to land and rivers, N emissions to air, and nutrient export to seas by river basins. Under current practice, inputs of N and P to land were 34.4 and 1.8 Tg·yr–1, respectively. However, only 12% of N and 3% of P reached the rivers. Agriculture was responsible for 55% of N and sewage for 67% of P in rivers. Reactive N emissions to air from agriculture were calculated at 4.0 Tg·yr–1. Almost two-fifths of N emissions to air were from animal housing and storage. Nearly a third of the basin area was considered as pollution hotspots and generated over half of N emissions to air and nutrient pollution in rivers. Over 25% of river export of N ended up in the Atlantic Ocean and of P in the Mediterranean Sea. These results could support environmental policies to reduce both air and water pollution simultaneously, and avoid pollution swapping.

Keywords： agriculture     air-water modeling     European rivers     nutrient pollution     sewage systems     source attribution    

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GASEOUS REACTIVE NITROGEN LOSSES FROM ORCHARDS, VEGETABLES AND TEA PLANTATIONS

Frontiers of Agricultural Science and Engineering 2023, Volume 10, Issue 2,   Pages 155-166 doi: 10.15302/J-FASE-2022477

Abstract:

● Gaseous N emissions from orchards, vegetables and tea plantations (OVT) are reviewed.

Keywords： fruit     greenhouse gas     green development     fertilizer management     climate change    

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Exergy losses in premixed flames of dimethyl ether and hydrogen blends

Tongbin ZHAO, Jiabo ZHANG, Dehao JU, Zhen HUANG, Dong HAN

Frontiers in Energy 2019, Volume 13, Issue 4,   Pages 658-666 doi: 10.1007/s11708-019-0645-8

Abstract: The exergy losses from the irreversibility sources, i.e., chemical reaction, heat conduction and speciesIt is observed that, regardless of the fuel blends, chemical reaction contributes most to the exergy lossesThe results also indicate that increased H substitution decreases the exergy losses from reactions,The decreases in exergy losses by chemical reactions and heat conduction are higher, but the exergy lossThe overall exergy losses in the DME/H flames decrease by about 5% with increased H substitution from

Keywords： second law analysis     flame     dimethyl ether (DME)     hydrogen     binary fuels    

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PLANT DENSITY, IRRIGATION AND NITROGEN MANAGEMENT: THREE MAJOR PRACTICES IN CLOSING YIELD GAPS FOR AGRICULTURAL

Frontiers of Agricultural Science and Engineering 2021, Volume 8, Issue 4, doi: 10.15302/J-FASE -2020355

Abstract: Here, we investigate current maize production at the field scale, analyze the yield gaps and impactingfactors, and recommend measures for sustainably closing yield gaps.The relative yield reached 70% in both years.Yield variability under drip irrigation was 12.1%, lower than the 18.8% under border irrigation.the yield-limiting factors.

Keywords： boundary line analysis     irrigation method     precision agriculture     spatial variability     yield gaps     yield-limiting factors    

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Test investigation on hydraulic losses in the discharge passage of an axial-flow pump

QIU Baoyun, CAO Haihong, JIANG Wei, GAO Zhaohui, WANG Fei

Frontiers of Mechanical Engineering 2007, Volume 2, Issue 1,   Pages 50-56 doi: 10.1007/s11465-007-0008-8

Abstract: passage, the discharge in the left channel is bigger than that in the right, and the passage hydraulic lossesThe methods deducing the hydraulic losses are investigated.The results indicate that the passage hydraulic losses are not proportional to the flow discharge.Compared with a circular pipe, the hydraulic losses of a divergent discharge passage are smaller andare also big, but a small circulation can slightly reduce hydraulic losses.
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The effect of conservation tillage on crop yield in China

Hongwen LI,Jin HE,Huanwen GAO,Ying CHEN,Zhiqiang ZHANG

Frontiers of Agricultural Science and Engineering 2015, Volume 2, Issue 2,   Pages 179-185 doi: 10.15302/J-FASE-2015058

Abstract: the Conservation Tillage Research Center (CTRC), Chinese Ministry of Agriculture (MOA), the mean crop yieldCrop yield increase was particularly significant in dryland areas and drought years.The mechanism for the yield increase in CT system can be attributed to enhanced soil water content and

Keywords： conservation tillage     crop yield     soil structure     development strategies    

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Breeding strategies for increasing yield potential in super hybrid rice

Shihua CHENG,Xiaodeng ZHAN,Liyong CAO

Frontiers of Agricultural Science and Engineering 2015, Volume 2, Issue 4,   Pages 277-282 doi: 10.15302/J-FASE-2015081

Abstract: To develop super hybrid rice, considerable effort should be made to explore genes related with high yield

Keywords： super hybrid rice     breeding strategies     yield potential    

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Highlight yield forming and innovative technologies in tropical crops

Wenquan WANG

Frontiers of Agricultural Science and Engineering 2016, Volume 3, Issue 4,   Pages 283-284 doi: 10.15302/J-FASE-2016128

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Numerical study of conduction and radiation heat losses from vacuum annulus in parabolic trough receivers

Dongqiang LEI, Yucong REN, Zhifeng WANG

Frontiers in Energy 2022, Volume 16, Issue 6,   Pages 1048-1059 doi: 10.1007/s11708-020-0670-7

Abstract: In this paper, conduction and radiation heat losses are analyzed respectively to identify the heat lossspecies, temperature of heat transfer fluid, and annulus size on the conduction and radiation heat losses

Keywords： parabolic trough receiver     vacuum annulus     rarefied gas     DSMC (direct simulation Monte Carlo)     heat loss    

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NUTRIENT USE EFFICIENCY AND LOSSES OF INDUSTRIAL FARMS AND MIXED SMALLHOLDINGS: LESSONS FROM THE NORTH

Yifei MA, Ling ZHANG, Zhaohai BAI, Rongfeng JIANG, Yong HOU, Lin MA

Frontiers of Agricultural Science and Engineering 2021, Volume 8, Issue 1,   Pages 58-71 doi: 10.15302/J-FASE-2020371

Abstract: Here, we aimed to quantify nutrient flows, nutrient use efficiency, and nutrient losses in differentTo produce 1 kg N and P in animal products, nutrient losses in industrial pig farms (2.0 kg N and 1.3kg P) were lower than in mixed pig smallholdings, nutrient losses in industrial dairy farms (2.7 kgLiquid manure discharge in industrial farms was the main losses pathway in contrast to mixed smallholdings

Keywords： industrial farms     mixed smallholdings     pig     dairy     nutrient management    

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YIELD AND FRUIT QUALITY OF ALMOND, PEACH AND PLUM UNDER REGULATED DEFICIT IRRIGATION

Frontiers of Agricultural Science and Engineering 2021, Volume 8, Issue 4,   Pages 583-593 doi: 10.15302/J-FASE -2020325

Abstract: Yield and fruit quality traits were determined. The effect of RDI differed between species.Yield and fruit size were reduced significantly only in peach under RDI-50.25% in peach and 50% in almond and plum with improvements in fruit quality without affecting total yield

Keywords： fruit quality / fruit yield / Prunus domestica / Prunus dulcis / Prunus persica / regulated deficit irrigation    

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Title Author Date Type Operation

Development and testing of a weather-based model to determine potential yield losses caused by potato

Alexey FILIPPOV, Maria KUZNETSOVA, Alexander ROGOZHIN, Olga IAKUSHEVA, Valentina DEMIDOVA, Natalia STATSYUK

Journal Article

CLIMATE-CHANGE-INDUCED TEMPORAL VARIATION IN PRECIPITATION INCREASES NITROGEN LOSSES FROM INTENSIVE CROPPING

Journal Article

Development of an analytical model to estimate the churning losses in high-speed axial piston pumps

Journal Article

NUTRIENT USE EFFICIENCY AND LOSSES OF INDUSTRIAL FARMS AND MIXED SMALLHOLDINGS: LESSONS FROM THE NORTH

Journal Article

HOTSPOTS OF NUTRIENT LOSSES TO AIR AND WATER: AN INTEGRATED MODELING APPROACH FOR EUROPEAN RIVER BASINS

Journal Article

GASEOUS REACTIVE NITROGEN LOSSES FROM ORCHARDS, VEGETABLES AND TEA PLANTATIONS

Journal Article

Exergy losses in premixed flames of dimethyl ether and hydrogen blends

Tongbin ZHAO, Jiabo ZHANG, Dehao JU, Zhen HUANG, Dong HAN

Journal Article

PLANT DENSITY, IRRIGATION AND NITROGEN MANAGEMENT: THREE MAJOR PRACTICES IN CLOSING YIELD GAPS FOR AGRICULTURAL

Journal Article

Test investigation on hydraulic losses in the discharge passage of an axial-flow pump

QIU Baoyun, CAO Haihong, JIANG Wei, GAO Zhaohui, WANG Fei

Journal Article

The effect of conservation tillage on crop yield in China

Hongwen LI,Jin HE,Huanwen GAO,Ying CHEN,Zhiqiang ZHANG

Journal Article

Breeding strategies for increasing yield potential in super hybrid rice

Shihua CHENG,Xiaodeng ZHAN,Liyong CAO

Journal Article

Highlight yield forming and innovative technologies in tropical crops

Wenquan WANG

Journal Article

Numerical study of conduction and radiation heat losses from vacuum annulus in parabolic trough receivers

Dongqiang LEI, Yucong REN, Zhifeng WANG

Journal Article

NUTRIENT USE EFFICIENCY AND LOSSES OF INDUSTRIAL FARMS AND MIXED SMALLHOLDINGS: LESSONS FROM THE NORTH

Yifei MA, Ling ZHANG, Zhaohai BAI, Rongfeng JIANG, Yong HOU, Lin MA

Journal Article

YIELD AND FRUIT QUALITY OF ALMOND, PEACH AND PLUM UNDER REGULATED DEFICIT IRRIGATION

Journal Article