蘋果樹施鉀(jia)肥的(de)最佳時期
適時適量(liang)(liang)(liang)地施(shi)(shi)用(yong)鉀肥(fei)(fei),能使果(guo)(guo)(guo)個明(ming)顯增(zeng)大,糖分增(zeng)加,提高著色度,還能使果(guo)(guo)(guo)色鮮艷,果(guo)(guo)(guo)皮光潔(jie),風味口感(gan)等(deng)內在品(pin)質得以改善。蘋果(guo)(guo)(guo)樹(shu)(shu)(shu)對(dui)鉀的吸收(shou)(shou),一般(ban)是(shi)7月上(shang)旬至8月初,在這段時間給果(guo)(guo)(guo)樹(shu)(shu)(shu)施(shi)(shi)入(ru)適量(liang)(liang)(liang)的鉀肥(fei)(fei),會(hui)收(shou)(shou)到事半功倍的效果(guo)(guo)(guo)。如在早春或花(hua)期前施(shi)(shi)入(ru)同等(deng)數量(liang)(liang)(liang)的鉀肥(fei)(fei),無論(lun)是(shi)對(dui)產(chan)量(liang)(liang)(liang)還是(shi)對(dui)著色度等(deng)都不會(hui)有明(ming)顯的效果(guo)(guo)(guo)。施(shi)(shi)用(yong)量(liang)(liang)(liang)可按每百公(gong)斤(jin)產(chan)量(liang)(liang)(liang)施(shi)(shi)純鉀一公(gong)斤(jin)為宜。如過(guo)量(liang)(liang)(liang)的施(shi)(shi)入(ru),反而會(hui)使果(guo)(guo)(guo)樹(shu)(shu)(shu)生理機能遭(zao)到破壞,影(ying)響對(dui)其他元素(su)的吸收(shou)(shou)利(li)用(yong)。蘋果(guo)(guo)(guo)樹(shu)(shu)(shu)施(shi)(shi)用(yong)鉀肥(fei)(fei)過(guo)量(liang)(liang)(liang)則(ze)表(biao)現出缺鎂癥,樹(shu)(shu)(shu)體內鈣的含(han)量(liang)(liang)(liang)也會(hui)相對(dui)降(jiang)低(di)。
另外(wai),在(zai)施(shi)用(yong)(yong)(yong)鉀(jia)肥時,應選用(yong)(yong)(yong)吸(xi)收(shou)利用(yong)(yong)(yong)率高(gao)(gao)和效(xiao)果明顯(xian)的(de)硫(liu)酸(suan)鉀(jia)為(wei)宜,其次是(shi)氯化(hua)鉀(jia),也(ye)(ye)可用(yong)(yong)(yong)草木灰或腐熟的(de)雞糞等含鉀(jia)量(liang)較(jiao)高(gao)(gao)的(de)有機肥于樹下撒施(shi),而后淺埋澆水(shui)。如用(yong)(yong)(yong)0.3%~0.5%磷(lin)酸(suan)二氫鉀(jia)溶液或氨基酸(suan)鉀(jia)300~500倍液進(jin)行葉面噴施(shi)補充(chong),也(ye)(ye)可收(shou)到較(jiao)好的(de)效(xiao)果。