Studyonnursery Substrate Of Sludge

Substrate nursery is the base of soilless culture in modern agriculture.For a long time,the commercial substrate mainly consumed natural resources as raw material,and caused serious damage to the ecological environment.Looking for Cheap waste materials to produce substrate is a research topic with broad prospects for development.It can not only protect the environment and achieve the recycling of resources,but also can avoid environmental pollution and reduce the waste of substances.On the other hand,with the continuous expansion of the scale of urban sewage plants,the growing living sludge has brought great pressure to environmental protection.If the fermentation of sewage sludge can be used to replace some of the traditional substrate,Substrate consumption problems will be alleviated,sludge waste can also find new treatment methods to achieve the purpose of comprehensive utilization of waste.1.This test respectively to sludge,cattle manure,pig manure,straw,sawdust and fungi residue as raw materials,according to the same carbon to nitrogen ratio(25:1)made hasT1(sludge: cow dung: straw =5:2:1,mass ratio,the same below),T2(sludge: cow dung: sawdust =4.5:2:1),T3(sludge: pig manure straw =4:2:1),T4(sludge: pig manure: sawdust =6:3.5:1),T5(sludge: cow dung: straw mushroom residue: =11:5:2:1)and T6(sludge: cow dung: straw mushroom residue: =12:7:2.5:1)6 kinds of sludge leavening,from two aspects of temperature change and germination index,the best substrate material was screened.T5 sludge leavening reached the high temperature stage for the longest time and the highest germination index.Therefore,T5 sludge leavening was used for the subsequent nursery substrate production.2.This test respectively to T5 sludge leavening,vermicompost,peat and soil as raw materials,according to different volume of ratio made has H1(sludge fermentation: vermicompost: peat =1:1:1 volume ratio,the same below),H2(sludge fermentation: vermicompost: peat =2:1:1),H3(sludge fermentation: turfy soil: garden soil =1:1:1),H4(sludge fermentation: turfy soil: garden soil =2:1:1,H5(sludge fermentation material: vermicompost: garden soil =1:1:1),H6(sludge fermentation: vermicompost: garden soil =2:1:1),H7(sludge fermentation: garden soil =1:1),H8(sludge fermentation: garden soil =2:1)8 kinds of substrates,to has production raditional substrate(peat: vermiculite =3:1)as control(CK),from substrate physico-chemical nature changes and nursery effect two aspects for evaluation and filter,respectively application substrates for pepper nursery test and tomato nursery test,Correlation analysis and the determination of indicators,physico-chemical properties of different substrate effects on growth and development of pepper or tomato.3.Analysis of physical and chemical properties of substrate:Compared with the traditional seedling substrate CK,the physical and chemical properties of the composite substrate were better,and the physicochemical properties of treatment H4 and H5 were the best.The total pores,water holding pores,pH,EC and total K of H4 were significantly higher than those of CK.The total pores,water holding pores,EC and total K of H5 were significantly higher than those of CK.5.Effect of pepper seedling culture experiment:Compared with CK,morphological indicators and photosynthetic characteristics of pepper Seedling of treatment H5(sludge leavening:vermicompost:soil =1:1:1)have been significantly improved.Especially,Seedling index and stomatal conductance of pepper Seedlings of treatment H5 respectively increased 3.07 times,2.69 times.5.Effect of tomato seedling culture experiment: Compared with control CK,the germination rate,fresh weight,dry weight,plant height,root length and seedling index of tomato Seedlings of treatment H4(sludge leavening:peat:soil =2:1:1)respectively increased 1.15 times,1.56 times,2.18 times,1.31 times,1.72 times and 1.45 times.Pb,Cr and Cd were the least heavy metals in seedlings treated with H4.Heavy metals Pb and Cr content of tomato Seedlings of treatment h4 is the least.6.Overall,treatment H5 could culture pepper seedling with the best quality,treatment H4 could culture tomato seedling with the best quality.