《天工开物·上篇·乃粒》
南方土壤与北方的不同，先将麦田经过多次地耕耙，然后用草木灰拌种，用手指拈着种子点播，接着用脚跟把土踩紧，代替北方用驴拉石磙子压土。
南地不与北同者，多耕多耙之后，然后以灰拌种，手指拈而种之。种过之后，随以脚根压土使紧，以代北方驴石也。
The soil in the south is different from that in the north. First, the wheat field is ploughed and harrowed several times, then the seeds are mixed with wood ash, and the seeds are sown by pinching them with the fingers, then the soil is tamped with the heels, instead of using a donkey to pull the stone roller to press the soil in the north.