Effects of Bagasse Ash and Lime Combined Application on Acidified Soil Improvement and Maize Plant Growth
[Objective]Apply tropical acid brick red soil with sugarcane bagasse ash and quicklime on the basis of replacing some chemical nitrogen fertilizer to explore the improvement effect of soil acidification.[Methods]The study was conducted by combining pot and field test,pot experiment set treatment 1:bagasse ash∶quicklime-1∶1(L1B1).treatment 2:bagasse ash∶quicklime-1∶2(L1B2).treatment 3:bagasse ash∶quicklime-1∶4(L1B4).treatment of pure chemical fertilizer as control(CK).The physiological growth of maize was measured at the seedling,jointing,booting,filling and maturity stages of maize growth,and the optimal proportion and optimal choice of quicklime and bagasse ash were explored.At the same time,field experiments were carried out,with pure chemical fertilizer nitrogen,phosphorus and potassium as the control(NPK),treatment 1:organic fertilizer replacing 30%chemical nitrogen fertilizer(M30),treatment 2:bagasse ash+quicklime(M30LB)was applied on the basis of 30%organic replacement,and the physical and chemical properties of soil were measured during the harvest.[Results](1)L1B1 treatment,compared with CK group,the maximum leaf length 11.05%,maximum leaf width 17.46%,crown width 27.55%and plant height 28.24%;Improve soil pH 1.41 units,soil rapid phosphorus 8.36%,alkali nitrogen 75.00%,exchangeable calcium ion content 1.08 times.(2)Field experiment M 30 LB treatment(70%NPK+organic fertilizer+bagasse ash+lime)had the best effect on soil acidification improvement,Increase in pH by 1.68 units from the control group(100%NPK),Soil alkali and nitrogen solution increased by 44.45%.The organic matter content was increased by 20.07%,The content of quick-acting phosphorus was increased by 40.81%,Nitro nitrogen content decreased by 26.06%.(3)Principal component analysis shows that soil aggregate,quick-acting phosphorus,organic matter and nitrate nitrogen have a relatively large impact on soil improvement effect,and the feedback effect is more obvious.There was a positive correlation between soil pH changes and soil organic matter,quick phosphorus,>0.25 mm aggregate,exchangeable calcium ions,and soil alkali and nitrogen lysis,and a negative correlation with soil nitrate nitrogen and<0.053 mm aggregate.[Conclusion](1)If the application of sugarcane ash is 10 g/kg,the use of quicklime in 2.5 g/kg～10 g/kg is beneficial to the growth of corn plants and the improvement of soil nutrients,and the improvement of soil pH.(2)the ratio of quicklime to bagasse ash in agricultural production is about 1∶2.(3)the application of bagasse and quicklime can reduce the application of agricultural nitrogen fertilizer,and reduce the pollution and negative impact of chemical fertilizer on the environment,which is of great significance to the improvement of soil acidification.
万方数据
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