Study on The Development of A Sustainable Agricultural Producing Technique by Non-Tilled Farming.

在八郎塘(D14田)沼泽重土上按计划进行了试验水田(包括常规耕田和免耕田)的研究和试验。结果表明：(1)与耕作水田相比，免耕水田5 cm、10 cm、20 cm、30 cm深的地温在耕作期间保持较高的温度。(2)土层氧化还原电位(Eh)与耕作水田相比，在积水灌溉期间，免耕稻田3.5、10、17.5、25、40 cm土层的氧化还原电位(Eh)均较高。结果表明，免耕稻田土壤各层氧化程度均高于耕作稻田。(3)…渗滤水中铁(Fe)和锰(Mn)的浓度较高，表层渗滤水中的铁浓度高于下层。尤其是耕作稻田的铁(Fe)浓度高于免耕稻田。(4)在3.5 cm深度，耕作水田下渗水的电导率(EC)高于免耕水田。水田和农田排水中悬浮物浓度分别为20.8 mg/L、78.4 mg/L、28.8 mg/L和159 mg/L。(6)蓄水灌溉期间，免耕和耕作稻田需水量(深度需水量)分别为12.6 mm/d和5.7 mm/d。较少

Researches and experiments were carried out as planned in experimental paddy fields, which consist of tilled and paddled fields (conventional) and non-tilled fields, of the marshy heavy soil in Hachiro-gata polder (D14 field).The results obtained are as follows :(1) Ground temperature in the experimental paddy fieldsCompared with tilled paddy fields, the ground temperature at the depths of 5cm, 10cm, 20cm, 30cm remained high in non-tilled paddy fields during the cultivation period. Especially, high temperature in the non-tilled paddy fields was favorable for the early growth of rice during the period of rice planting to taking root.(2) Oxidation reduction potential (Eh) in soil layrCompared with tilled paddy fields, the values of oxidation reduction potential (Eh) at the depths of 3.5,10,17.5,25,40cm remained high in non-tilled paddy fields during the ponding irrigation period. It shows that soil layrs in non-tilled paddy fields were more oxidized than those in tilled paddy fields.(3) … More Density of iron (Fe) and Manganese (Mn) in descent percolation waterThe density of iron (Fe)in decent percolaton water was higher in upper plow layr than that in subsoil. Especially, the density of iron (Fe) in tilled paddy fields was higher than that in the non-tilled paddy fields. The density distribution of manganese (Mn) showed the same tendency as that of iron (Fe).(4) Electric conductivity (EC)The electric conductivity (EC) in descent percolation water in tilled paddy fields were higher than that in the non-tilled paddy fields at the depth of 3.5cm. EC in the non-tilled and tilled paddy fields tended to rise at the depth of 40cm.(5) Density of SS (suspended solid) in water on the paddy field and farm drainThe density of SS after rice planting in water on the paddy field and farm drain of non-tilled and tilled paddy field were 20.8mg/l, 78.4mg/l, 28.8mg/l and 159mg/l respectively.(6) Water requirement rate (water requirement in depth)Water requirement rate of the non-tilled and the tilled paddy field were 12.6mm/d and 5.7mm/d respectively during the ponding irrigation period. Less