At the same time, the systematic approach has pointed up many widespread and growing plant nutrient deficiencies such as Zn and S in rice and other crops, B in many areas where rapeseed is grown and a host of other site and crop specific nutrient deficien
At the same time, the systematic approach has pointed up many widespread and growing plant nutrient deficiencies such as Zn and S in rice and other crops, B in many areas where rapeseed is grown and a host of other site and crop specific nutrient deficien
同时，系统方法揭示出许多普遍存在的和继续发展的植物养分缺乏问题，诸如水稻和其它作物缺锌缺硫，油菜产区大面积缺硼，以及许多地方的作物特有的缺素问题。