在进行水稻旱直播时,播幅要宽,播深要浅,要达到2公分深,8公分宽,才能合乎农业上的要求。我们是利用谷物播种机进行水稻旱直播的,在开沟器上联接一个播幅加宽器(根据东北查哈阳农场所介绍的方法制成)。试验结果,播深和播幅都合乎要求,但是有一缺点,就是种子没有被浮土覆盖,在灌水时种子会浮起或被冲走。在播种机后带镇压器及覆土环,也没有解决问题。这时,我队修理班技工刘守法同志,发现了播幅加宽器所掘起的土壤,都分在播行两侧,如果将两侧土壤合垅,覆土问题就可解决。他就想了一个办法,用铁板制成了八字形的覆土器,用铁丝挂在播幅加宽器后面。这样在播种当中,前面的播幅加宽器分土,后面的覆土器覆土,种子就能埋在浮土下面,深度合乎要求。覆土器用铁板制成,前部宽20公分,高8公分,后部宽8公分,高2公分,如下图所示。覆土器造成前宽后窄和前高后低的形状,可使播行两边的土很好合垅,多余的土,可以越过后部,而不致发生堵塞。覆土器重1公斤,前部有两孔,用铁丝 Dry rice in the broadcast, the broadcast width should be broadcasted shallow, to reach 2 cm deep, 8 cm wide, in order to meet the agricultural requirements. We used the corn seeder to dry the rice field. We connected a stenter (based on the method described in Chahayang Farm in Northeast China) to the opener. The test results, sowing and sowing are satisfactory, but there is a flaw is that the seeds are not covered with floating soil, the seeds will float or be washed away when irrigation. After the planter with a crusher and casing ring, also did not solve the problem. At this time, my team repair mechanic Liu Shou-fa comrades, found that the sowing width of the soil excavated, are split in the broadcast on both sides, if both sides of the soil together, covering problems can be solved. He thought of a way of making a figure-eight crust with iron plates, hanging behind wire width stretchers with wire. So in sowing, in front of the sowing breadth of soil, cover the earth behind the soil, the seeds can be buried beneath the surface of the earth, the depth of the desired. Cover made of iron, the front width of 20 cm, 8 cm high, 8 cm wide at the back, 2 cm high, as shown below. The width of the front cover, the width of the front cover, the height of the rear cover, and the height of the front cover, which are low, make it possible for the soil on both sides of the broadcast to co-operate well. Excess soil can pass over the rear part without clogging. Clay weight 1 kg, the front has two holes, with wire