Yu, Li-zhi; You, Hai-xia; Wang, Gan; Sun, Xue-yan - In: Asian Agricultural Research 04 (2012) 10
In order to get the formation about the content of alkali-hydrolyzable nitrogen in soil, available phosphorus and available potassium, and the input of chemical fertilizer in apple orchard, we survey 25 peasant households' input of chemical fertilizer in apple orchard, and collect soil samples...