Detection of Cyanide in Pollution-free Livestock Product Breeding Water by Ion Chromatography

In order to verify the accuracy of ion chromatography for cyanide detection,optimization conditions were studied,and comparison was made for the detection results of cyanide between titration and isonicotinic acid pyrazolone spectrophotometry. The results showed that ion chromatography has good linearity and reproducibility,with the recovery rate of 95%-105% and the limit of detection of 0. 001 mg/L. This method is simple,rapid,safe,selective,and suitable for the determination of cyanide in pollution-free livestock product breeding water.

Greenhouse Production Technical Procedure for Pollution-free Food

This procedure specifies production area environment, production technology, prevention and control of plant diseases and insect pests, and production files of pollution-free foods by taking tomato as an example. This procedure is applicable to greenhouse production of pollution-free food in Shandong Province.

Occurrence and Pollution-free Control of Apolygus lucorum in Winter Jujube

In recent years, Apolygus htcorum has become the main pest of winter jujube. It sucks juice of young parts of winter jujube and causes falling of buds and flowers, leaf perforations, deformities and fall- off of fruits, leading to serious economic loss. Considering the occurrence characteristics and control problems, the distribution, occurrence regularity, damage characteristics and outbreak reasons of A. lucorum are overviewed and analyzed in this paper, and the pollution-free control measures are also put forward.

Evaluation on Heavy Metal Pollution of Soil in Pollution-free Agricultural Product Bases in Guangxi

Using data of 6 pollution-free agricultural product bases in Guangxi Zhuang Autonomous Region,this paper analyzed content of heavy metals,including arsenic(As),mercury(Hg),lead(Pb),cadmium(Cd),and chromium(Cr) in soil.After Pb,Cd,Cr,Hg and As content in soil is determined,it evaluated the pollution of soil using single factor pollution index method and Nemerow synthetic pollution index method in combination with evaluation standard of heavy metals in soil and grading standard for soil pollution.Analysis results indicate that As,Hg,Pb,Cd,Cr content is different in pollution-free agricultural product bases,but all conform to related standards and there is no standard exceeding problem.It is concluded that the quality of soil in pollution-free agricultural product bases is excellent,not polluted and completely meet requirements of evaluation standards,and suitable for developing pollution-free agricultural products.

Analysis on the Factors Influencing Pollution-free Vegetable Production: A Case Study of Shenzhen Huantong Farming Products Co. Ltd.

More than 170 vegetable farmers and vegetable production in 4 vegetable farms of Shenzhen Huantong Farming Products Co.Ltd.were investigated,and the factors affecting the quality of vegetable products were analyzed.The development strategies of pollution-free vegetables,such as strengthening training of vegetable farmers,reducing vegetable farmers’mobility and vegetable brand building,were put forward.

Pathways toward a pollution-free planet and challenges

The mission of“Establishment of Zero-Pollution Earth”defined by United Nations Environment Programme aims at creation of a clean,safe and prosperous home for all human beings.It is of rational choice from each individual to protect our environment and demonstrates our great ambition to achieve our goals.The key message given in this article is that,zero pollution does not mean no discharge of pollutants and instead it can be achievable through optimizing and controlling a sound balance between pollutants discharge and capacities of decontamination through treatment and natural environmental accumulation,which can be termed as“Principle of Equilibrium”between pollution and decontamination.Based on this principle,we propose and illustrate several key factors and synergistic pathways toward a pollution-free planet:quantitative determination on purification and wastewater;source control through green measures;minimization of negative side-effects;precise management through digitalized systems;and keeping sound balance between pollutants and natural purification.It should be noted that we would face a series of difficulties and challenges in moving forward to“Zero-Pollution Earth”.We should further develop theories,principles and tools to achieve the balance between quantity of pollutants and decontamination capacities.Environmentalists should work together to break through the bottleneck limited by“Principle of equilibrium”to establish new environmental remediation systems leading to“Zero-Pollution Earth”.

Tomato Green Cultivation Technology of Reducing Fertilizer and Pesticide Input and Increasing Fertilizer Efficiency

According to the technical approach of green production and yield increase pattern,green,pollution-free,quality and efficiency improvement can be achieved by reducing nitrogen,controlling phosphorus and stabilizing potassium,replenishing sulfur,zinc,iron,manganese and boron from the aspects of controlling fertilizer,drug and water.The main measures include combination use of organic and inorganic fertilizer,effective control of the amount of nitrogen and phosphate fertilizer,reduction of the application amount of chemical fertilizers and pesticides,and rational crop rotation to reduce the occurrence of diseases and insect pests,which can improve the yield and quality of tomato.