The Effects Of Organic-inorganic Compound Fertilizer Made By Biogas Residue On The Plant Growth And Soil Fertility At Seedling Stage Of Three Crops

A pot experiment with 'dafeng 30' variety of maize (Zea mays L.) and 'Xinwuyueman' variety of rape(Brassica campestris L.) as exoerimental plant was conducted to study the effects of different organic inorganic compound fertilizers made by biogas resdue on the plant growth and soil nutrients of three crops at the seedling stage. So as to provide theoretical basis for the efficient agricultural resource utilization of biogas resdue. The results showed that:(1) Except the W1 of inorganic compound fertilizer treatment, its soil organic matter content was slightly lower than that of CK at the seedling stage of the third crop rape, the rest of the fertilization treatments increased the soil organic matter content in different degrees at the seedling stage of three crops. The treatments of different organic inorganic compound fertilizers made by biogas resdue were the best in increasing soil organic matter and were 8.62%-27.85% higher than that in treatment CK, the treatments of different biogas resdue was the next best and were 4.70%-14.05% higher than that in treatment CK, and the treatments of different inorganic compound fertilizers were the worst and were only -1.66%-3.83% higher than that in treatment CK. The increasing effects of different fertilization treatments on soil organic matter all decreased with the increase of the number of crop planting.(2) The different fertilization treatments all increased soil total N, available P, and available K in different degrees at the seedling stage of three crops. Soil total N increased 0.96%-81.51% than CK, available P increased 0.84%?350.64% than CK, and available K increased 6.75%?25.82% than CK. The increases of soil total N, available P, and available K were the relative biggest in the treatments of different organic inorganic compound fertilizers made by biogas resdue at the seedling stage of three crops and the increasing effects were up with the increase of the number of crop planting. The increasing effects were relative small in treatments of different biogas resdues.(3) The different fertilization treatments all increased the plant height, root length, shoot dry weight, and root dry weight in different degrees at the seedling stage of three crops. Plant heights increased 5.68%?127.03% than CK, root lengthes increased 3.33%?553.47% than CK, and the dry weights of shoot and root increased 51.06%?481.76% and 35.44%?522.19% than CK respectively. The increasing effects of different organic inorganic compound fertilizers made by pig dung biogas resdue on the plant height, root length, shoot dry weight, and root dry weight were the best at the seedling stage of three crops and the different organic inorganic compound fertilizers made by straw biogas resdue were the next best. The effects of inorganic compound fertilizers also were good at the seedling stage of the feirst crop,but the effects were decreased with the increase of the number of crop planting. The effects of different biogas resdues were the worat.The fertilization treatments all increased the plant total N, total P, ant total K contents in different degrees at the seedling stage of three crops. The total N contents of shoot and root increased 2.30% 47.87% and 3.52%-178.95% than that of CK respectively, the total P contents of shoot and root increased 7.85%-114.24% and 19.84%-117.58% than that of CK respectively, and the total K contents of shoot and root increased 1.82%-67.08% and 0.42%-56.14% than that of CK respectively. The the plant total N, total P, ant total K contents were all relative highest in the treatments of organic inorganic compound fertilizers made by biogas at the seedling stage of three crops. The increasing effects of different inorganic compound fertilizers were almost equal to that of different organic inorganic compound fertilizers made by biogas resdue, but it decreased more bigger than that of organic inorganic compound fertilizers made by biogas resdue.The conclusion was that the effects of organic inorganic compound fertilizers made by biogas resdue on soil organic matter, soil nutrients, and plant growth were better than that of inorganic compound fertilizers and had the better aftereffect.