论文部分内容阅读
1.试验目的与处理的选择通过试验,明确怎样提高玉米拔节期追施氮肥的效应,并具体了解下述6个分组比较的问题,必须选择7个处理:①拔节期不施肥。②表土追施硝铵。③刨窝1.5寸浅施硝铵。④刨窝3寸深施硝铵。⑤表土追施碳铵。⑥刨窝1.5寸浅施碳铵。⑦刨窝3寸深施碳铵。试验为等氮量追肥。通过试验需要回答的问题和合理选择处理应相互渗透在一起考虑。为了解决某些问题必须选择相应的有关处
1. Test purpose and treatment options Through experiments, it is clear how to improve the effect of topdressing nitrogen fertilizer at the jointing stage and understand the following six groups of comparison problems, you must choose seven treatments: ① jointing without fertilization. ② topdressing ammonium nitrate. Â ’¢ 1.5 inch shallow mucosal ammonium nitrate. Â ’¢ 3-inch deep-nesting ammonium nitrate application. ⑤ top dressing ammonium bicarbonate. ⑥ ⑥ nest mound 1.5-inch shallow facilities ammonium bicarbonate. ⑦ 3-inch deep nest made of ammonium bicarbonate. Test for nitrogen fertilizer top-dressing. The questions that need to be answered through the test and the reasonable choice of treatment should be considered together. In order to solve some problems must choose the appropriate office