Rye sown in the fall and plowed into the soil in early spring leaves a residue that is highly effective at controlling broad-leaved weeds, but unfortunately for only about 45 days. No major agricultural crop matures from seed in as little as 45 days. Synthetic herbicides, on the other hand, although not any longer-lasting, can be reapplied as the crop grows. Clearly, therefore, for major agricultural crops, plowing rye into the soil can play no part in effective weed control.
The argument is most vulnerable to the objection that it fails to
|
解析
|
|
2327| 3
|
百思不得其解，这个题是那种类型啊？如何下手？请NN分析下吧？ |
| ||
| ||
手机版|ChaseDream|GMT+8, 2025-9-13 06:03
京公网安备11010202008513号 京ICP证101109号 京ICP备12012021号
ChaseDream 论坛
© 2003-2025 ChaseDream.com. All Rights Reserved.
发表于 2009-10-25 08:01:00
