Development of Selenium-rich Passion Fruit Industry in Guangxi

According to the understanding of current situation of Guangxi selenium-containing passion fruit products and the advantages and disadvantages of related product markets,the corresponding improvement plans were proposed for the supply and demand of products and the adjustment of industrial development,so as to provide theoretical data support for optimizing the industrial structure and increasing the market share of selenium-rich passion fruit in Guangxi.

Heavy Metal Contamination in Farmland Soil and Bioremediation Measures: A Case Study of the Mining Area in Shaoguan

With the rapid development of mining,the soil heavy metal contamination is increasingly serious in Shaoguan,directly affecting the production of crops. This paper analyzes the farmland soil heavy metal contamination in the mining area of Shaoguan and the causes of heavy metal contamination in recent years,brings forward the bioremediation measures to control soil heavy metal contamination,and points out the development direction of bioremediation in farmland soil heavy metal contamination in the mining area.

Integrated Control of Agricultural Non-point Source Pollution to Provide Safe and Healthy Drinking Water for Rural Areas

Agricultural non-point source pollution has become the main part of water pollution prevention and control in China. This paper made a brief introduction to the causes and hazards of agricultural non-point source pollution and the current situation of agricultural non-point source pollution prevention and control in China. In view of the serious agricultural non-point source pollution in water environment of Guangxi and the difference in quality of drinking water between urban and rural areas,it came up with recommendations for strengthening agricultural non-point source pollution prevention and control from scientific distribution,linked operation and maintenance,popular science education,and legal system construction,to guarantee safe and healthy drinking water in rural areas.

Remediation Technology for Combined Pollution of Lead and Cadmium in Farmland Soil

At present,the problem of heavy metal pollution in farmland in southern China is serious. Especially,the cadmium and lead are two heavy metal elements with serious pollution and great harm to human body. This paper reviewed some common methods and materials used in the control of cadmium and lead pollution in farmland soil. Then,it discussed the problems in the repair of cadmium and lead pollution in farmland soil. It came up with the future research direction,to provide references for remediation of lead and cadmium pollution in farmland soil.

Development of Acidification-resistant Organic Fertilizer for Improvement of Acid Red Soil in Guangxi

The soil in Guangxi has been severely acidified,restricting sustainable development of agriculture.In this paper,based on the screening of organic fertilizer additives,a method for the production of acidification-resistant organic fertilizer specific for acid red soil improvement was proposed,and the developed acidification-resistant organic fertilizer was used in sugarcane experiment.The results showed that in the treatment that the specific acidification-resistant organic fertilizer was applied,the yield of sugarcane significantly increased,the p H value of soil effectively increased,the physical and chemical properties of soil improved,and the contents of microorganisms and available nutrients in soil increased.

Advances in Studies on Interaction between Selenium and Heavy Metal Cadmium

Selenium is an essential functional element of the human body,and the issue of selenium accompanying heavy metals is receiving much concern.This paper expounded the form of existence of selenium and cadmium in soil and influencing factors of their bioavailability,and further elaborated the interaction between selenium and cadmium.On the basis,it provided references for further studies on the interaction between selenium and cadmium,and provided basis for establishing selenium-enriched barrier technology for crops.

Current Development and Prospects of Selenium-enriched Moringa oleifera Industry in Guangxi

Due to its unique economic value,Moringa oleifera Lam. has become a tree species with great development potential. This paper firstly introduced the value of development and utilization of M. oleifera in nutrition,medicinal,industrial,greening,etc. Then,focusing on the current development status of M. oleifera industry in Guangxi and combining Guangxi's resource conditions,it came up with recommendations for the comprehensive development and rational utilization of M. oleifera. Besides,it made a prediction of the prospect of Se-enriched M.oleifera industry in Guangxi.

Effects of Plant-derived Humic Acid Organic Fertilizer on Selenium Content of Rice in Northern Guangxi

This study was to find out the suitable application amount of plant-derived humic acid organic fertilizer for selenium-rich rice production in northern Guilin area by applying the fertilizer at different amounts.The results showed that plant-derived humic acid organic fertilizer could effectively activate selenium in selenium-rich soil,and then promote the uptake of selenium by rice.With costs,selenium enrichment and rice yield as the main evaluation indicators,A4 was chosen as the best treatment,that is,the application of 4 500 kg/hm^2 of plant-derived humic acid organic fertilizer as base fertilizer could achieve the best benefit.

Optimization of Extraction Process of Anthocyanins from Selenium-enriched Purple Potato by Response Surface Methodology

Ultrasound-assisted extraction method was applied to extract the anthocyanins from selenium-enriched purple potato,and the optimum extraction conditions for anthocyanins in selenium-enriched purple potato were obtained by response surface methodology:the phosphoric acid concentration of 1.0%,the solid-liquid ratio at 5,and the extraction time of 19 min.Under these conditions,the yield of anthocyanins in selenium-enriched purple potato reached(0.409±0.010)mg/g(RSD=2.51%,n=3).The extraction of anthocyanins from selenium-rich fresh purple potato with dilute phosphoric acid has the advantages of less acid consumption and good extraction effect.

Study on the Activation Effect of Fermented Organic Fertilizers on Selenium in the Soil of Southern Dragon Fruit Orchards

[Objectives]This study was conducted to explore the effects of using fermented organic fertilizers such as cow manure on the activity of selenium in the soil.[Methods]The project team applied the organic fertilizer prepared by fermenting cow manure and other raw materials to activate selenium in the soil at two dragon fruit orchard bases in Shilong Town,Guiping City and Dingdang Town,Long an County,and carried out many years of experiments.[Results]The contents of available selenium in the two experimental orchards in Shilong Town and Dingdang Town increased by 10%and 5%,respectively,and the selenium contents in dragon fruit increased by 228.6%and 200.0%,respectively.[Conclusions]The application of fermented organic fertilizers such as cow manure can increase available selenium content in the soil,thereby increasing the selenium content of dragon fruit.

Comparative Analysis of Sugar Production Cost in Guangxi and World Major Producing Countries

Guangxi is the largest sugar producing area in China and shoulders heavy responsibilities for the development of China’s sugar industry.In recent years,China’s sugar industry has been greatly impacted by the foreign low-cost sugar industry,and the planting area of sugarcane has been declining.The development foundation of the sugar industry is the sugarcane seed industry.Under the impact of foreign low-price sugar,China’s sugarcane industry is under greater pressure for development,and the sugarcane seed industry shoulders more arduous responsibilities.In order to cope with international competition,the development of Guangxi’s sugarcane industry urgently needs to establish a development model oriented towards improved varieties,scale and mechanization of sugarcane,so as to promote the high-quality development of Guangxi’s sugarcane industry and effectively respond to the pressure of competition in the international sugarcane industry.

Effects of Amino Acid Selenium Foliar Fertilizer on Selenium Content and Quality of Mango

[Objectives]This study was conducted to explore the treatment methods of amino acid selenium fertilizer suitable for increasing the selenium content of mangoes and improving the quality of mangoes,so as to provide a theoretical basis for the production of selenium-enriched mangoes.[Methods]With Tainong mango as a test material,the amino acid selenium foliar fertilizer was applied by eight treatment methods to investigate the changes of selenium,soluble solid,vitamin C,and titratable acid contents in mango flesh and peel.[Results]Spraying amino acid selenium foliar fertilizer increased the selenium content of mango flesh.The selenium contents of the treatment groups T2,T3,T4 and T5 reached the selenium-enriched standard,and the T2 treatment group had the highest selenium content(0.020 mg/kg).The selenium contents in the peel of all treatment groups were greater than the corresponding selenium content in the flesh.Except for T1,the vitamin C contents of other treatment groups sprayed with amino acid selenium fertilizer increased compared with the control,and that of the T2 treatment group increased significantly(P<0.05).Compared with the control,the soluble solids of the treatment groups sprayed with amino acid selenium fertilizer once also increased.The treatment method of spraying amino acid selenium fertilizer with a dosage of 12000 ml/hm2 once(T2)achieved the best effect of increasing the selenium content and improving the quality of mangoes.[Conclusions]This study provides a scientific basis for increasing the selenium content of mangoes and improving the current situation of insufficient selenium intake.

Isolation and Identification of Selenium-tolerant Strains from Selenium-rich Soil in Guangxi

To provide reference for selenium resource exploitation of soil,many selenium-tolerant strains were isolated from selenium-rich soil in Guangxi. The dilution spread plate method and selenium-added culture method were used to screen the selenium-tolerant strains from the soils which were sampled from the main Selenium-rich areas such as Yongfu,Bama,Yulin Hanshan,Guiping and Tengxian. The results showed that 8 strains with high selenium tolerance were obtained,which could tolerate the selenium concentration above 10 000 μg/m L in solid medium. Among the 8 strains,YLB1-33 showed the highest selenium tolerance,and it could still grow weakly in the solid medium with selenium concentration of 29 000 μg/m L. The sequencing of 16 S rD NA and phylogenetic analysis showed that YLB1-6 was identified as Bacillus cereus,BMB2-1 and TXB1-8 were identified as Bacillus pumilus,GPB2-5 was identified as Bacillus thuringiensis,YLB1-26 and YLB1-33 were identified as Bacillus licheniformis,and YLB1-2 and YFB1-8 were identified as Serratia marcescens. The finding of selenium-tolerance strains had potential application value on promoting the utilization of selenium soil resources and the development of selenium-rich agricultural products in Guangxi.

Study on Extraction Method of Selenium-enriched Rice

[Objectives] The aims were to optimize the extraction process of selenoproteins from selenium-enriched rice in Guangxi and provide references for the intensive processing and comprehensive utilization of selenium protein resources. [Methods]Selenium-enriched rice was used as materials to extract selenoproteins by phosphate buffer extraction method and to optimize the extraction process of selenoproteins by using the orthogonal experiment. Proteins and selenium content was measured by Coomassie Brilliant Blue G-250 reagent and AFS（ atomic fluorescence spectrometry） respectively. [Results] The most significant factor affecting extraction of rice Selenoproteins was extraction NaO H concentration,followed by the ratio of solid-liquid,temperature and then extraction time. The optimum extraction conditions of selenoproteins from rice were extraction temperature of 50 ℃,NaO H concentration of 0. 14 mol/L,extraction time of 5 h,and solid-liquid ratio of 1∶ 30. [Conclusions]The alkali extraction process optimized by orthogonal test could effectively improve the extraction rate of selenoproteins,and the optimized process parameters could be popularized and applied in practical production.

Spatiotemporal Coupling of Water and Fertilizer for Double-cropping Grape in Guangxi

This paper summarizes the research progress and major achievements of the coupling effect of water and fertilizer on grape cultivation in China and abroad in recent years,emphatically analyzes the application status and some problems of the coupling effect of water and fertilizer on double-cropping grape cultivation mode in Guangxi Zhuang Autonomous Region,discusses the key problems to be further resolved,and finally makes the relevant recommendations.

Form and Interconversion Factor of Selenium in Soil

In recent years,production and processing of natural selenium-rich agricultural products has become a research hotspot. The main factor affecting the selenium content in plant is the content of effective selenium in soil. So it is important to understand the form and conversion relationship of selenium in soil and find ways to improve selenium effectiveness. By summarizing the researches on selenium at home and abroad,we analyze the classification of soil selenium form,the transformation among different selenium forms and the improving factors of selenium effectiveness. We understand the relationship between chemical form and extraction form of selenium,analyze the driving factors of conversion among different forms,and discuss the ways to improve selenium effectiveness of soil in high selenium-rich area. By combining characteristics of soil and crop in different selenium-rich regions,different selenium activation methods are used,which could provide more scientific evidence for further selenium research.

Management Models and Development Strategies of the Farmers’ Professional Cooperatives in the Western Poor Counties and Regions of China: A Case Study of Long’an County,Guangxi

In the new era,an important task is how farmers’professional cooperatives to better adapt to new development environment and effectively solve the problems that"who will cultivate land"and"who does agriculture depend on"in the future.In this paper,model and development direction of farmers’professional cooperatives in Long’an County of Guangxi are analyzed and studied based on realistic development background of Guangxi.

Effects of Raising Chickens Under Moringa oleifera Forests on Soil Nutrients and Selenium Absorption by M. oleifera

[Objectives]This study was conducted to investigate the effects of raising chickens under Moringa oleifera forests on soil nutrient changes and selenium absorption by M.oleifera.[Methods]The nutrient contents of the soil and the selenium contents of different parts of M.oleifera were determined and analyzed.[Results]Raising chickens under the investigated M.oleifera forest improved the soil.Compared with the control,the soil organic matter,hydrolyzable nitrogen,available phosphorus,and available potassium of the plots for underforest chicken raising were significantly improved;the changes were the most significant within the range of 2 m from the chicken houses,respectively,and the values were 1.39,1.38,1.52 and 1.31 times of the control,respectively;soil bulk density decreased,total porosity increased,soil structure and permeability improved,and soil pH values at 2 and 5 m away from the chicken houses were significantly higher than the control by 0.34 and 0.28 unit,respectively;and raising chickens under the forest promoted the absorption and utilization of selenium in M.oleifera,and the selenium contents in stems and leaves of M.oleifera were 1.64 times and 1.51 times of the control,respectively.[Conclusions]This study provides a theoretical basis for the high-value selenium-enriching compound economic model of raising chickens under M.oleifera forests.

Status,Existing Problems and Countermeasures of Industrialization of Se-enriched Agriculture in Guangxi

With the rapid development of China's agricultural production and the improvement of people's living standards and health awareness,people's demands for food quality and nutrition have become increasingly strong. Agricultural products that meet various functional needs such as nutrition,health care and safety are increasingly favored by the general public. Se,one of the trace elements necessary for the human body,has begun to be applied and developed in medicine and other life sciences. Developing Se-enriched agricultural relying on Guangxi's unique Se-enriched soil resources is of great significance to enhance people's quality of life,increase the added value of agricultural products,and promote the transformation and upgrading of modern agriculture in the region. Starting with the development status and advantages of industrial development of Se-enriched agriculture in Guangxi,the main problems existing in the current industrial development of Se-enriched agriculture in Guangxi were summarized,and specific countermeasures were put forward in this paper,so as to provide theoretical support for the development of Se-enriched agriculture in Guangxi.