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

本研究在八郎田圩区沼泽性重土试验田（D14田）上，按计划进行了耕作、水田（常规田）和免耕田的试验研究，结果如下：（1）试验田的地温与耕作田相比，免耕田在耕作期内，5cm、10 cm、20 cm、30 cm土层的地温始终较高。特别是在水稻播种至生根期间，免耕田的高温有利于水稻的早期生长。(2)土壤氧化还原电位（Eh）在积水灌溉期间，与翻耕稻田相比，免耕稻田土壤3.5、10、17.5、25、40 cm土层的氧化还原电位（Eh）值较高。这表明，免耕稻田土壤氧化程度高于翻耕稻田。（三） ...更多信息 下渗水中铁、锰的浓度下渗水中铁的浓度在耕层上部高于耕层下部。特别是翻耕稻田土壤中的铁浓度高于非翻耕稻田。锰（Mn）的密度分布与铁（Fe）的密度分布趋势一致。(4)电导率（EC）在3.5cm处，耕层稻田的下降渗滤水电导率（EC）高于非耕层稻田。免耕稻田和翻耕稻田的EC在40 cm处有升高的趋势。(5)稻田和农田排水中悬浮物浓度种植水稻后，稻田和农田排水中悬浮物浓度分别为20.8mg/l、78.4mg/l、28.8mg/l和159 mg/l。(6)积水灌溉期需水速率（深度需水）：免耕田为12.6mm/d，翻耕田为5.7mm/d。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