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| 1 | Coupling model and optimal combination scheme of water,fertilizer,dissolved oxygen and temperature in greenhouse tomato under drip irrigation显示文摘Water-fertilizer coupling technology has been widely used in the world.Poor soil aeration,low temperature or high temperature can affect the rate of nutrient uptake by crop roots.Aiming at the interaction between water,fertilizer,dissolved oxygen and temperature(WFOT)coupling model and irrigation flux of tomato in greenhouse,using these four factors with a five-level uniform-precision rotatable central composite design,a mathematical model was established among the four factors affecting tomato yield in a greenhouse,and the optimal combination scheme of WFOT was obtained.Within the test range,tomato yields increased with increasing irrigation quotas(X_(1)),fertilization amount(X_(2)),dissolved oxygen(X_(3))and geothermal pipe water temperature(X_(4)).The magnitude of the effect of each factor of WFOT on tomato yield was in the following order:X_(1),X_(2),X_(4),X_(3)(spring and summer),and X_(1),X_(3),X_(2),X_(4)(autumn and winter).The interaction between high water-low heat and low water-high heat were beneficial for yield increase(spring and summer),the high fertilizer-low heat and low fertilizer-high heat interactions were beneficial to yield increase(autumn and winter).If WFOT agronomic measures were adopted according to the 95%confidence interval,there was a 95%probability that the spring-summer tomato yield will be higher than 89902 kg/hm^(2).The WFOT coupling scheme was X_(1)of 4808-5091 m3/hm^(2),X_(2)(N-P_(2)O_(5)-K_(2)O)of 171-57-84 to 186-62-89 kg/hm^(2),X_(3)of 7.9-8.2 mg/L,and X_(4)of 34.9°C-37.0°C.There was a 95%probability of tomato yield higher than 85209 kg/hm^(2)in autumn and winter,and the WFOT coupling scheme was X_(1)of 5270-5416 m3/hm^(2),X_(2)(N-P_(2)O_(5)-K_(2)O)of 151-50-76 to 167-56-82 kg/hm^(2),X_(3)of 8.0-8.2 mg/L,and X_(4)of 34.1°C-36.2°C.Overall,and the model had a very good simulation effect,with application value.The relative error between spring-summer and autumn-winter yields ranged from 1.12%to 25.34%.The results of the study can provide a theoretical basis for improving the quality and efficiency of greenhouse tomatoes. | Zan Ouyang Juncang Tian Ce Zhao Xinfang Yan | 2021 | International Journal of Agricultural and Biological Engineering2021，14，6： | 1 |
| 2 | Migration of Heavy Metal Elements in Reclaimed Irrigation Water-Soil-Plant System and Potential Risk to Human Health显示文摘[Objectives]To study the impact of heavy metal pollution of soil and plants during the process of reclaimed water for irrigation of green land in arid areas and the potential health risks to humans during use.[Methods]Taking Zhongwei City in Ningxia,a typical arid area,as the research area,the irrigation water,soil and green grass in the reclaimed water irrigation region and the original green water irrigation region were sampled,the heavy elements Hg,As,Zn,Pb,Cd,Cr were detected,and the Nemerow method,biological absorption coefficient,and health risk assessment were employed to evaluate the degree of soil pollution,plant absorption capacity,and human health risks.[Results]Compared with the original green water,the Hg,Cd,and Cr pollution of the reclaimed water irrigated green land was higher,the As,Zn,Pb pollution was lower,and the content of Hg and Cd was higher than the environmental background values of soil in Ningxia;the Cr content exceeded the risk intervention values of the first type of land in the Soil Environmental Quality—Risk Control Standard for Soil Contamination of Development Land(GB 36600-2018).Compared with the original green water irrigation region,it is found that the reclaimed water irrigation reduced the heavy metal pollution of the soil to a certain extent.The heavy metal content of tall fescue grass(Festuca arundinacea)in the reclaimed water irrigation region was Zn,Cr,Pb,As,Cd,and Hg from high to low;the order of the biological absorption coefficient was Cd>As>Zn>Pb>Hg>Cr;irrigation water exerted a certain effect on the content of heavy metals in plants and the biological absorption coefficient through the soil.Using the health risk assessment method recommended by Environmental Protection Agency of the United States of America(USEPA),it was found that the reclaimed water has the highest risk through the inhalation route,and the occupational population has a higher risk of skin contact with soil and plants.[Conclusions]This study is intended to provide data support and theoretical basis for the environmental safety risk research of the application of reclaimed water in arid areas to urban greening. | Zixi LIU Juncang TIAN Wangcheng LI Lian TANG Jie WANG Haiyan GAO | 2021 | Asian Agricultural Research2021，13，10： | 1 |
| 3 | Starch accumulation, activities of key enzyme and gene expression in starch synthesis of wheat endosperm with different starch contents显示文摘 | Zibu Wang Weihua Li Juncang Qi Peichun Shi Yongan Yin | 2014 | Journal of Food Science and Technology2014，，3： | 1 |
| 4 | An experimental study of dry pulverized-coal gasification in a pressurized airflow bed 显示文摘 | Ren Yongqiang (任永强) Xu Shisen (许世森) Xia Juncang (夏军仓) Li Xiaoyu (李小宇) | 2007 | Journal of Engineering for Thermal Energy and Power (热能动力工程)2007，22，4： | 1 |
| 5 | Effects of water,fertilizer,dissolved oxygen and temperature coupling on the photosynthesis,quality and yield of lettuce显示文摘With the increased demand for vegetables of nutritional value,enhancing vegetable quality while pursuing high yield has become a goal of many investigators.In the present study,the effects of irrigation quota(A),fertilizer amount(B),dissolved oxygen(DO,C),and temperature in the climate chamber(D)applied in combination with the quality and yield of lettuce were investigated.Four-factor and three-level orthogonal designs were used to determine the single-factor trend,the sequence of primary and secondary influencing factors,and optimal regulatory measures concerning the lettuce.The order of the primary and secondary effects on the plant height,net photosynthesis rate(P_(n)),transpiration rate(E),vitamin C content(V_(c)),soluble protein content(S_(p)),dry matter accumulation(Dm),yield,irrigation water use efficiency(IWUE)of the lettuce plants followed the order A>B>D>C.In addition,the order of the primary and secondary effects on the intercellular carbon dioxide concentration(C_(i)),chlorophyll content,and nitrate content followed the order A>D>B>C.The optimum scheme for lettuce was A3B2C1D3(irrigation quota of 69 mm;fertilizer amount of 1.30 g/pot;DO of 6.5 mg/L;and temperature in the climate chamber of 20℃).Under the coordinated regulation of water,fertilizer,air,and temperature,the quality and yield of lettuce have been significantly improved.This study had important reference significance for the comprehensive regulation of water,fertilizer,air,and temperature facilities for vegetables. | Zan Ouyang Juncang Tian | 2023 | International Journal of Agricultural and Biological Engineering2023，16，5： | 0 |
| 6 | Effects of drip irrigation and cropping on soil salinity,ionic composition and waxy corn production in a severely saline and calcareous and gypsiferous soil显示文摘Drip technologies have been suggested as practical for irrigation under conditions of high salinity and for reclamation of saline soils.Drip irrigation triggered by soil water potential thresholds was applied to both reclaim a severely saline calcareous gypsiferous soil and irrigate a waxy corn crop(Zea mays L.sinesis Kulesh).However,there is a lack of knowledge on the sustainability of reclamation of saline soils with drip irrigation and the changes in soil salinity and salt ion composition during the amelioration process.Therefore,effects on soil salinity,its ionic composition,and on crop growth and yields were evaluated in an experiment conducted in the Yinchuan Plain,northwest China.Treatments included fields in their first to fourth years of the drip irrigation reclamation-cropping scheme and adjacent native,non-cropped or irrigated salinesodic land as control.Yield of waxy corn increased and days of growth to maturity decreased as a function of time and reclamation management.The improvement in crop performance could be largely credited to the reduction of soil salinity and changes in salt composition under the drip-irrigated reclamation protocols.The drip irrigation regime created a region of low salinity proximal to the emitters conducive to germination and plant growth.Deleterious ions for crop growth such as Na+and Cl^(-)were reduced while Ca2+and Mg2+concentration increased,especially in the upper 40 cm of soil.After only a single season of drip-irrigated waxy corn production,both Cl-SO_(4)^(2-)ratios and sodium adsorption ratio(SAR)decreased dramatically.The results suggested that drip irrigation is an effective technology for reclamation of severely saline-affected soils,such as those widely distributed over the Ningxia Plain in China and that this or similar reclamation strategy could be appropriate for reclamation of other hard to manage calcareous and gypsiferous soils. | Junli Tan Yaohu Kang Yanping Jiao Shuqin Wan Xina Wang Juncang Tian Ran Erel Alon Ben-Gal | 2023 | International Journal of Agricultural and Biological Engineering2023，16，5： | 0 |
| 7 | Information Technology Research on Productivity Evaluation of Gravel-mulched Field in Ningxia显示文摘The evaluation process of traditional land productivity is relatively complex,and the evaluation indices and results cannot display visually.With the development of geographic information system science,there are more and more studies on the GIS-based land productivity evaluation.GIS system can combine the evaluation model with information system software,realizing the visual display of all the evaluation factors.In this paper,with the development process of GIS-based management information system as references,the management information system for GIS-based gravel-mulched field productivity evaluation was designed and developed by combining with the SI model for gravel-mulched field productivity evaluation.The system was developed under VB environment,integrated with MapInfo,and the evaluation results could be shown visually in the system windows. | Bin WANG Juncang TIAN | 2019 | Agricultural Biotechnology2019，8，3： | 0 |
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