Effect Of Bioorganic Fertilizer And Lime On Soil Fertility, Yield And Quality Of Cassava

Under different lime levels,effects of bioorganic fertilizer on soil fertility and growth,physiological,yield and quality characters of cassava were investigated using pot and field experiments.Pot experiment has three lime levels,i.e.0 g,25 g and 37.5 g/pot(0 g CaO,1 g CaO and 2 g CaO/kg soil). and five bioorganic fertilizer levels(pecentage of organic N to total N,the same as below),i.e.0%,25%,50%,75%and 100%.Field experiment has three lime levels,i.e.0,285 and 570 kg/ha and three bioorganic fertilizer levels,i.e.0%,25%and 50%.The main results indicated that:1.Bioorganic fertilizer increased soil organic matter,available N and K content.Lime reduced the soil organic matter,available N and K contents.2.Bioorganic fertilizer improved soil invertase activity,but decreased the catalase activity to some extent.In the pot experiment,compared to the control treatment,100%,75%and 50%of bioorganic fertilizer treatment increased soil invertase activity by 127%,93.1%and 61.7%respectively. Lime could increase soil urease activities significantly.Compared to the 0 lime treatment,soil urease activity was increased by 34.1%-56.1%and 25.9%-101.0%when applied with 1g and 2g CaO/kg soil,respectively.3.Appropriate ratio of bioorganic fertilizer could increase leaf soluable sugar content and leaf chlorophyll content.Compared to the control treatment (CK),leaf soluable sugar content was increased by 5.3%at 25%of bioorganic fertilizer treatment(76 d after planting,DAP),and leaf chlorophyll content was increased by 3.5%at 50%of bioorganic fertilizer treatment(116 DAP)in the field experiment,And leaf chlorophyll content increased by 14%at 75% of bioorganic fertilizer treatment(90 DAP)in the pot experiment.4.In the field experiment,compared to the CK,bioorganic fertilizer treatments increased leaf N content by 12.53%-13.89%,but decreased the leaf K content.And lime desreased the leaf N content.5.Compared to the CK,25%of bioorganic fertilizer treatments increased the yield by 8.3%and starch yield by 8.9%.The above-mentioned results indicate that 25%-50%of bioorganic fertilizer can increase the soil organic matter,available N and K contents and improve invertase activity and the yield and starch yield of cassava.Lime can increase the urease activity,but decrease the soil organic matter,available N and K contents.