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1、根据作物养分需求选择营养型水溶肥。
番茄的幼苗期对养分吸收量较小,从第一穗果膨大开始,养分的吸收逐渐增加,氮素吸收速率迅速增大;番茄对磷的吸收以生长前期为主;番茄对钾的吸收量在营养元素中居首位,从第一穗花序坐果期至拉秧期,钾素吸收比例越来越大,在收获末期其吸收比例接近氮素的二倍。因此,施瑞德认为在番茄生长整个生育期水溶肥选择要遵循前期以氮、磷为主,中期以氮、钾为主,后期以钾、氮为主。
ZAIXUANZEHESHIYONGZHUIFEIYONGFEISHI,YINGGENJUMUBIAOCHANLIANG、TURANGYANGFENGONGYINGZHUANGKUANGYIJIQIANQIYOUJIFEIHEJIFEITOURUQINGKUANGQUEDINGFANQIEZHUIFEIZONGLIANG,RANHOUGENJUBUTONGSHENGYUQIYANGFENXUQIUGUILV,JINXINGHELIDESHIFEI。RUZAISHIYONGDALIANGYOUJIFEIDEQINGKUANGXIA,YINGXUANZEDILINFEILIAOPEIFANG;DANGTURANGFEILIJIAOCHA,SHIRUIDERENWEIKEZAIYOUMIAOQIXUANZEGAOLINDESHUIRONGFEI;ERDUIYUTURANGSUXIAOJIALEIJILIANGHENGAODEDAPENG,XUYAOKAOLVZHONGJIAHANLIANGBINGFUYISHUIRONGXINGMEIPEIFANGDESHUIRONGFEI,YIFANGYINJIASUGUOGAOBILIGONGYINGYINQIGAI、MEIYANGFENLIZIDEJIEKANGZUOYONG。
(2) 根据种植问题选择功能型水溶肥。
在肥料选择时可以根据肥料的功能与特点进行选择。对于土壤酸化、板结的菜田,可以选择腐植酸水溶肥进行土壤的改良;对于连作的菜田,可以选择生物型有机水溶肥来改善土壤根区微生态环境。而对于反季节生产的蔬菜在肥料选择上,施瑞德认为可以选择含氨基酸、腐植酸、海藻酸等具有促根抗逆作用的功能型水溶肥,在冬季釆用此类肥料对果类菜进行灌根施肥,能够促进蔬菜根系的呼吸与生长,提高果类菜的抗低温胁迫能力,改善作物的品质。
(3) 根据产值与施肥方式选择合适的水溶肥和叶面肥。
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