Studies On Effect Of Agronomic Management Practices On Organic Fertilization Of Sandy Soil

The paper systematically studied the effects of agronomic managementpractices(AMP) on the fertility of a infertile sandy soil by method of field trial andculture experiments. The decomposition and mineralization laws of organic matterswas analyzed, the qualities and amounts of organic matters affected by addingorganic-fertilizer, fertilizer, irrigation and water-retaining agents. And there was a clearunderstanding on the mechanism and degree of organic quality and quantity impactedby different agricultural measure impact on have with the soil this, and on this basis,the research will develop the scientific and technical theories for addingorganic-fertilizer inthe soil. The main results were as follows:1. The decomposition and mineralization laws of organic matters were systematicallystudied by pipe and nylon-bag experiment. The research showed that thedecomposition trend of several used organic matters. Maize straw >wheat straw>chicken manure >cow manure >pig manure. The decomposition rate of straws wasobviously higher than that of manures. Various kinds of organic materials weredecomposed fastest the beginning 90 days of used soil, exceeding 60% of all amountsof the whole year decomposition, and then it becomes slow. The decomposition trendis basically similar during different stages. During different stage of one year, LOM had obviously rise or fall, and there isthe LOM maximum on 180 days. The LOM content of 360 days decomposition waslower than one of90 days in various degree. LOM generally reaches the maximum inannual March and April. And both organic content and LOM content had the obviouscorrelation. The research had shown minerization rate of sandy soil was 3.06%, too.2. Through a long-term experiments of adding organic-fertilizer making a research thatthe effect of organic quantity and quality impacted on different organic fertilizer used,The result indicated, Under maize-wheat crop rotation terms and adding 56河南农业大学 2004 届硕士学位论文organic-fertilizer of sandy soil, after one year, it is obvious to increase in the treatmentof adding organic-fertilizer than before.The treatment of straws increase 22.9% ,chicken manure for 12.8% , pig's manure for 16.5%. While organic-fertilizers wereapplied for three months, TOM and NLOM of each treatment obviously increased, butLOM didn't have obvious law. Compare to CK, And TOM ofeach treatment of addingorganic-matters appeared in various degree increase than before. Straw, chickenmanure and pig manure increasing 22.9% , 4.8% , 5.5% respectively. LOM of theformer two increased as 13.4% and 7.7%, but the latter's LOM had dropped by 22.6%.Under maize- wheat crop rotation terms, Kos of each fertilizer treatment was obviouslybelow than CK's, and CK's Kos dropped from 2.13 of maize season to 2.08 of wheatseason. Kos of fertilizer treatments had a increase in various degree.3. Showed that the effect of accumulation and transformation, quantity and quality oforganic matter were influenced by compound of different fertilizers at sandy soil, theinfluence and change law of organic matter were clearly further shown throughapplying fertilizer. The result showed, Nitrogen fertilizer used alone was unfavorableto accumulation of organic matter and organic fertilizer in sandy soil. The compoundof nitrogen and phosphorus was favorable to the accumulation of organic matter, sowas the compound of nitrogen, phosphorus and potassium, and the compound ofnitrogen, phosphorus and potassium with organic too. At the same time, only appliednitrogen-fertilizer was favorable to the increase of LOM, but unfavorable to theaccumulation of TOW. NP , NPK and NPK +M were favorable to the improvementof TOM content, but unfavorable to the content of raising LOW.4. Pour water condition impact and function mechanism on organic matter of sandysoil was determined clearly. The effect of pour water condition on organic matterdistribution in soil bo...