Research for the effect on the yield and quality of tobacco by using different proportion of ammonium nitrogen and nitric nitrogen shows that:in the same nitrogen amount,if only fertilizing ammonium nitrogen,tobacco grows better,the leaf is too thick and become yellow slowly,and if just fertilizing nitric nitrogen,tobacco absorbs and grows too fast,nitric nitrogen is easy to lose.and tobacco is shorter and smaller,leaf is relatively small,become yellow fast.So if use proper proportion between them,the tobac...
【更新日期】
2006-08-25
【分类号】
S572
【正文快照】
烤烟生产施用的氮素形态主要是铵态与硝态,其大田施用的作用及比例有不同的报道。例如,加拿大安大略省农业和食品部曾规定该地区烤烟中铵态氮(NH4+-N)应占75%;最近William Acourt等在安大略Peihi研究所的研究也表明,随着铵态氮比例的增加,烤烟的产量增加、质量提高。Evans H J?