The bulk weight and total flour extraction rate were more sensitve to nitrogen and phosphorus supply than 1000-grain weight. 氮磷水平与比例的提高，对各基因型千粒重的影响很小，却使容重显著降低，总出粉率普遍显著增加。
An amendent should decrease bulk density, increase toltal porosity, and incr ease water and air content. 改良剂能降低容重，增加总孔隙度，增加水和空气的含量。
