Key Laboratory of Crop Ecophysiology and Farming System in Southwest China

Liucheng, China

Key Laboratory of Crop Ecophysiology and Farming System in Southwest China

Liucheng, China

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Yao R.,Key Laboratory of Crop Ecophysiology and Farming System in Southwest China | Yao R.,Sichuan Agricultural University | Chen X.,Key Laboratory of Crop Ecophysiology and Farming System in Southwest China | Chen X.,Sichuan Agricultural University | And 5 more authors.
Zhongguo Zhongyao Zazhi | Year: 2012

GAP production of medicinal plants needs diseases' green control during their cultivation processes. In this article, The authors summarized the achievements in cultural control and biological control to crops' diseases, taking the characteristics of medicinal plants into account, we put out the notion of the green control to medicinal plants' diseases, and indicated that the green control for medicinal plants' diseases should combine with cultural control, modern phytopathology methods, biological control and essential pesticides, besides, we introduced some suggestions and the prospect, to provide a reference for green control of medicinal plants' diseases in their GAP production.


Ma J.,Sichuan Agricultural University | Lei X.L.,Key Laboratory of Crop Ecophysiology and Farming System in Southwest China | Ma R.C.,Sichuan Agricultural University
Applied Mechanics and Materials | Year: 2013

In order to improve the seeding quality of paddy planter, some parts of rice seed-metering, such as sufficient regulator and delivery tube, were optimally designed, and field experiment was completed to optimize the structural and working parameters. Central composite design was employed to as design the experimental plan by means of the Design-Expert software (Version 7.0). The parameters of travel speed (A), sufficient regulator's angle (B) and length of delivery tube (C) were selected as influence factors, and seeding quality rate(y1), damage ratio of seeding(y2) and ratio of seeding holes(y3) were chosen as objective indexes. Regression models were established and analyzed based on Design-Expert and SAS software. The experiment results indicated that sufficient regulator improved quality of seeding and ratio of seeding holes especially with a few rice seeds in seed room. Under experimental conditions, the importance of each variable on y1, y2 and y3 was A>C>B, C>B>A and C>B>A and effects of the interaction of A and C on y1, the interaction of B and C on y2 and the interaction of A and C on y3 were significant by response surface analysis. By multiple objective programming, the optimal parameters were obtained as follow: travel speed of 2.8km/h, angle of sufficient regulator of 72° and delivery tube's length of 0.25m. This study has important significant to well improvement seeding quality of rice direct-seeding. © (2013) Trans Tech Publications, Switzerland.


Liu W.,Sichuan Agricultural University | Liu W.,Key Laboratory of Crop Ecophysiology and Farming System in Southwest China | Zou J.,Sichuan Agricultural University | Zou J.,Key Laboratory of Crop Ecophysiology and Farming System in Southwest China | And 8 more authors.
Plant Production Science | Year: 2015

Forming a method of judging the degree of soybean vining in the intercropping system is very important for estimating the shade tolerance of soybean germplasm and choosing the special soybean varieties for intercropping system. Thirty varieties were subjected to two treatments (sole and maize-soybean relay strip intercropping system) with three replications in a complete randomized block design. Light environment characteristics in two cropping systems were measured. At the beginning of the bloom stage of soybean when maize was mature, the soybean stem morphology characteristics stem length, node number, hypocotyl length, internode length, stem diameter, stem breaking strength and stem biomass were measured. The results revealed that the intercropped soybean could capture 13.8% photosynthetic active radiation at the vegetative stage, as compared with the sole crop soybean, with longer soybean main stem, internode and hypocotyl, and lower stem diameter at this stage. The relative value of agronomic traits in the sole and intercropping system could be used to calculate the vining severity index (VI) and the weighted vining index (WVI), and the latter could be used as the comprehensive index of the degree of soybean vining in the relay strip intercropping system. Based on the values of WVI, through the Hierarchical Cluster Analysis, the soybean varieties were divided into the 5 clusters, normal, mild, moderate, severe and extreme vining. Eight of the 30 varieties of soybean were normal vining grade and could be used as the parent plants to breed special varieties for intercropping. © 2014, Crop Science Society of Japan. All right reserved.


Wu Y.,Sichuan Agricultural University | Wu Y.,Key Laboratory of Crop Ecophysiology and Farming System in Southwest China | Gong W.,Sichuan Agricultural University | Gong W.,Key Laboratory of Crop Ecophysiology and Farming System in Southwest China | And 8 more authors.
Plant Production Science | Year: 2016

In relay intercropping systems, late-planted crops often grow under the shade of the canopy of early-planted tall crops and then transfer to full sunlight after the harvest of the early-planted crops. In order to know the effects of recovery growth of the late-planted soya bean in maize-soya bean relay intercropping, a field experiment was carried out to observe architectural, morphological, physiological and anatomical traits of soya bean plants related to shade and subsequent removal in intercropping before and after maize harvest, respectively. During shade period, soya bean biomass was severely reduced, and stem elongation was stimulated. Typical features of shade grown leaves were found, such as lower LMA (leaf mass per unit area), thinner thickness, higher chlorophyll content, lower chlorophyll a:b ratio. Whole-plant leaf area analysis found that soya bean increased leaf area ratio by adjusting leaf morphology rather than by dry mass allocation. After maize harvest, leaf area and leaf mass increased rapidly, contributing to compensation growth in intercropped soya bean. Meanwhile, physiological and anatomical traits of leaf went back to similar levels as grown in sole cropping. However, stem morphological traits were irreversible after removal of shade. Finally, no difference on seed weight per plant of soya bean was observed between relay intercropping and sole cropping. Based on these findings, we speculated the recovery growth might be the direct determining factor on pod formation in soya bean, and improvement on the capacity of recovery growth could increase yield of relay intercropped soya bean. © 2016 The Author(s). Published by Taylor & Francis.


Xiao R.L.,Sichuan Agricultural University | Xiao R.L.,Key Laboratory of Crop Ecophysiology and Farming System in Southwest China | Xiao L.L.,Chuzhou University
Advanced Materials Research | Year: 2014

At present the Maize picker has the large power consumption problem. The paper design a Maize picker device, the device is effective to reduce the power consumption of corn harvest machine work. By the virtual prototyping technology, completed the design of the overall structure of the Maize picker device. © (2014) Trans Tech Publications, Switzerland.


Fan Q.-J.,Sichuan Agricultural University | Liu J.-L.,Sichuan Agricultural University | Liu J.-L.,Key Laboratory of Crop Ecophysiology and Farming System in Southwest China | Sun L.,Chengdu Electric Power Bureau | And 7 more authors.
Analytical Methods | Year: 2015

An LC-ESI-Q-TOF MS/MS method coupled with multivariate statistical analysis was developed for chemical fingerprinting of Cyathula officinalis Kuan. Ten peaks were selected as common peaks, and cyasterone was used as a reference. The relative areas of the common peaks were used for hierarchical clustering analysis, principal component analysis and similarity calculation. A total of 31 samples collected from different sources were classified into three groups (principal component analysis) or four groups (hierarchical clustering analysis). The similarities of the 31 batches of C. officinalis samples were between 0.653 and 0.999. The results obtained suggested that the chromatographic fingerprint technique could efficiently evaluate C. officinalis. This journal is © The Royal Society of Chemistry.


Liu J.-L.,Sichuan Agricultural University | Liu J.-L.,Key Laboratory of Crop Ecophysiology and Farming System in Southwest China | Zheng S.-L.,Sichuan Agricultural University | Zheng S.-L.,Key Laboratory of Crop Ecophysiology and Farming System in Southwest China | And 7 more authors.
Molecules | Year: 2014

High-pressure ultrasound-assisted extraction technology was applied to extract ferulic acid, senkyunolide I, senkyunolide H, senkyunolide A, ligustilide and levistolide A from Ligusticum chuanxiong rhizomes. Seven independent variables, including solvent type, pressure, particle size, liquid-to-solid ratio, extraction temperature, ultrasound power, and extraction time were examined. Response Surface Methodology (RSM) using a Central Composite Design (CCD) was employed to optimize the experimental conditions (extraction temperature, ultrasonic power, and extraction time) on the basis of the results of single factor tests for the extraction of these six major components in L. chuanxiong rhizomes. The experimental data were fitted to a second-order polynomial equation using multiple regression analysis and were also examined using appropriate statistical methods. The best extraction conditions were as follows: extraction solvent: 40% ethanol; pressure: 10 MPa; particle size: 80 mesh; liquid-to-solid ratio: 100:1; extraction temperature: 70 C; ultrasonic power, 180 W; and extraction time, 74 min. © 2014 by the authors; licensee MDPI, Basel, Switzerland.


Ma J.,Sichuan Agricultural University | Lei X.L.,Key Laboratory of Crop Ecophysiology and Farming System in Southwest China | Ma R.C.,Sichuan Agricultural University
Applied Mechanics and Materials | Year: 2014

In order to optimize the structure and technology parameters of rotary drying, mathematical models of effective residence time and mass of loading were established based on the motion of solid particles in rotary dryer. Uniform design was applied in experimental design with material of rapeseed. Four independent variables such as structural parameter (cylinder inclination angle) and operating parameters (the rotation speed of rotary dryer, solids feed speed and airflow speed) were investigated. Prediction models of effective residence time and mass of loading were established by using software DPS7.05 to optimize the experimental design. The experiment results showed that under experimental conditions, the effects of airflow speed, rotation speed, the interaction of rotation speed with airflow speed and the interaction of rotation speed with solids feed speed on effective residence time were significant. Rotation speed, airflow speed, the interaction of cylinder inclination angle with solids feed speed and the interaction of feed speed with airflow speed had significant influences on mass of loading. By optimizing with multiple objective programming, the optimal parameters were obtained as follow: cylinder inclination angle of 1.8°, rotation speed of rotary dryer of 4 r/min, solids feed speed of 2.5 kg/s and airflow speed of 2.4 m/s. The research has important significance to well improve structure and technology parameters of rotary drying technology in solids drying. © (2014) Trans Tech Publications, Switzerland.


Shen S.,Sichuan Agricultural University | Cheng H.,Sichuan Agricultural University | Li X.,Sichuan Agricultural University | Li T.,Key Laboratory of Crop Ecophysiology and Farming System in Southwest China | And 3 more authors.
European Food Research and Technology | Year: 2014

Four purified polysaccharides (COP-H, COP-U, COP-E, and COP-A) were obtained from seed cake of Camellia oleifera Abel. by hot water extraction, ultrasonic-assisted extraction, enzyme extraction, and alkali extraction, respectively. Their structural characterizations were determined, and antioxidant activities were investigated. The results of FT-IR demonstrated that the characteristic absorption bands exhibited slight difference among four polysaccharides. HLPC analysis presented that the molecular weights were calculated to be 394, 297, 462, and 429 kDa for COP-H, COP-U, COP-E, and COP-A, respectively. GC-MS analysis showed that the monosaccharide compositions were identical to four polysaccharides, while the molecular ratios exhibited significant difference. Four polysaccharides showed antioxidant activities in a concentration-dependent manner. Among four polysaccharides, COP-E showed a higher scavenging activity on DPPH, hydroxyl radical, and superoxide anion radical. These findings suggest camellia seed cake polysaccharides have potential as a natural antioxidant. © 2014 Springer-Verlag Berlin Heidelberg.


Shen S.,Sichuan Agricultural University | Chen D.,Yunnan Academy of Agricultural Sciences | Li X.,Sichuan Agricultural University | Li T.,Key Laboratory of Crop Ecophysiology and Farming System in Southwest China | And 3 more authors.
Carbohydrate Polymers | Year: 2014

Based on a single-factor test, a central composite design was used to optimize the extraction conditions of polysaccharides from leaves of Paris polyphylla Smith var. yunnanensis (Franch.) Hand.-Mazz. Three independent variables, including extraction temperature (C), ratio of water to raw material, and extraction time (h), which significantly affected the yield of polysaccharides, were investigated. The experimental data were fitted to a quadratic polynomial equation using multiple regression analysis and also examined using appropriate statistical methods. The optimum conditions were as follows: extraction temperature, 90.8 C; ratio of water to raw material, 21.3:1; and extraction time 4.8 h. Under these conditions, the experimental yield was 54.18%, which matched the predicted value well. Furthermore, the purified polysaccharide exerted strong antioxidant effects on DPPH, hydroxyl, and superoxide radicals in vitro. © 2014 Elsevier Ltd.

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