保(bao)護(hu)地(di)黃(huang)瓜(gua)產(chan)量(liang)高(gao),產(chan)值(zhi)也(ye)高(gao),是(shi)保(bao)護(hu)地(di)主(zhu)栽(zai)作(zuo)物(wu)。但(dan)在(zai)生(sheng)產(chan)施(shi)肥(fei)過(guo)程(cheng)中(zhong),往(wang)往(wang)存(cun)在(zai)著(zhe)很(hen)多(duo)誤(wu)區(qu),不(bu)僅(jin)影(ying)響(xiang)黃(huang)瓜(gua)產(chan)量(liang),也(ye)影(ying)響(xiang)著(zhe)品(pin)質(zhi)和(he)效(xiao)益(yi)。筆(bi)者(zhe)根(gen)據(ju)多(duo)年(nian)生(sheng)產(chan)經(jing)驗(yan),總(zong)結(jie)出(chu)以(yi)下(xia)幾(ji)種(zhong)誤(wu)區(qu)並(bing)提(ti)出(chu)改(gai)進(jin)措(cuo)施(shi)。
一、施用未腐熟的有機肥
youjifeizaiduiouguochengzhong,daliangweishengwudehuodongjiangdafenzideyoujizhifenjiechenghuangguanenggouxishouliyongdexiaofenzi。fushuyoujifeizhonghandaliangweishengwu,zhexieweishengwudehuodong,nenggouyouxiaoyizhiturangzhongbingjundeshengchang、fanzhi,kejianqingbinghaifasheng。shiyongweifushudeyoujifeibujinbunengjishibuchonghuangguasuoxudeyangfen,xiangfanweishengwudehuodonghaitonghuangguazhengfeiliao,bingchuxianshaogenxianxiang。lingwai,yixieyiyoujizhiweishenghejishengzaizhiwuzuzhineidehaichonghebingjun、病毒等,常常隨施肥被帶入田間,當外界條件適宜時,開始活動,危害黃瓜。因此,施用的有機肥一定要經過高溫堆漚。
二、有機肥用量少,化肥使用過量
要yao獲huo得de黃huang瓜gua高gao產chan,有you機ji肥fei和he化hua肥fei應ying合he理li配pei用yong。有you機ji肥fei是shi黃huang瓜gua養yang分fen的de巨ju大da補bu給gei源yuan,可ke提ti高gao土tu壤rang中zhong多duo種zhong養yang分fen的de含han量liang,改gai善shan土tu壤rang理li化hua性xing質zhi,防fang止zhi土tu壤rang板ban結jie,提ti高gao土tu壤rang解jie毒du的de效xiao果guo,淨jing化hua土tu壤rang環huan境jing,因yin此ci有you機ji肥fei施shi用yong量liang不bu能neng減jian少shao。化hua肥fei的de施shi用yong要yao根gen據ju黃huang瓜gua的de需xu求qiu量liang,在zai各ge個ge生sheng長chang期qi中zhong分fen批pi施shi入ru,從cong而er有you利li於yu養yang分fen的de有you效xiao利li用yong,注zhu意yi防fang止zhi一yi次ci過guo量liang施shi用yong,造zao成cheng養yang分fen流liu失shi、汙染水源和惡化土壤環境等。
三、不尊重黃瓜生長規律,隨意施肥
黃瓜一生中對養分的需求量和吸收的養分種類是有差別的。黃瓜生育期間對氮素的需要量最大,而磷素對黃瓜根係、葉子、種子的發育形成起重要作用,黃瓜對鉀素比較敏感,前期缺鉀對比後期缺鉀對產量的影響更大,嚴重時不結瓜。因此,將磷、鉀肥做基肥和前期追肥,施肥效果十分明顯,整個生育期間應均衡施用氮肥。
四、不注重配方施肥,缺乏微肥
有you機ji肥fei的de施shi用yong雖sui然ran補bu充chong了le土tu壤rang養yang分fen,增zeng加jia了le土tu壤rang中zhong的de微wei量liang元yuan素su,但dan在zai耕geng地di複fu種zhong指zhi數shu如ru此ci高gao的de今jin天tian,遠yuan不bu能neng滿man足zu黃huang瓜gua生sheng長chang的de需xu要yao,尤you其qi是shi在zai整zheng個ge生sheng育yu期qi中zhong需xu施shi入ru大da量liang的de氮dan肥fei。但dan施shi入ru氮dan肥fei過guo多duo,將jiang影ying響xiang黃huang瓜gua對dui其qi他ta營ying養yang元yuan素su的de吸xi收shou,導dao致zhi缺que素su症zheng的de發fa生sheng以yi及ji造zao成cheng黃huang瓜gua產chan量liang、品質的降低。因此,在黃瓜整個生育期中,要注重配方施肥,最好是采用測土配方施肥和葉麵補施微肥。
五、撒施尿素後立即澆水
尿(niao)素(su)是(shi)酰(xian)氨(an)氮(dan)肥(fei),易(yi)溶(rong)於(yu)水(shui),施(shi)入(ru)土(tu)壤(rang)後(hou)要(yao)經(jing)過(guo)分(fen)解(jie)才(cai)能(neng)轉(zhuan)化(hua)為(wei)碳(tan)酸(suan)氫(qing)銨(an),被(bei)黃(huang)瓜(gua)吸(xi)收(shou)利(li)用(yong)。撒(sa)施(shi)後(hou)立(li)即(ji)澆(jiao)水(shui),易(yi)使(shi)尿(niao)素(su)隨(sui)水(shui)流(liu)失(shi),降(jiang)低(di)肥(fei)效(xiao)。所(suo)以(yi),在(zai)施(shi)用(yong)尿(niao)素(su)時(shi)要(yao)根(gen)據(ju)黃(huang)瓜(gua)發(fa)育(yu)對(dui)肥(fei)水(shui)的(de)需(xu)要(yao)情(qing)況(kuang),提(ti)前(qian)追(zhui)施(shi)、深施,可比淺施提高利用率28%。
六、鈣鎂磷肥在堿性土壤上做基肥
gaimeilinfeishiruosuanxingfeiliao,burongyushui,zairuosuanxingtiaojianxiacainengzhubuzhuanhuaweishuirongxinglinsuanyanbeizuowugenxixishou。erzaijianxingturangshangshiyong,jiejuebulehuangguayoumiaoduilindepoqiexuyao,yizaochengquelin。
七、過磷酸鈣地表撒施做追肥
磷在土壤中移動性小,移動範圍在1—3厘米之間,所以表施很難傳送到黃瓜根係,起不到補充磷元素的作用。
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