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采用盆栽试验,研究3种粒径交联聚丙烯酰胺与尿素配施对香蕉苗期生长及氮素吸收、淋失、残留、表观损失等氮素去向的影响。结果表明,与尿素1次单独施用相比,交联聚丙烯酰胺(CPA)配施尿素1次施用能显著提高香蕉的苗期株高,平均提高13.19%,氮素淋失量显著减少,平均减少15.92%,氮素残留量明显增加,平均增加13.42%;L粒径(粒径在1.6~4.0 mm之间)CPA配施尿素能显著提高香蕉苗期的干物质质量及氮素吸收量,分别较无CPA处理提高58.42%、59.86%,与尿素分3次施用处理无显著性差异;L粒径CPA配施尿素处理的氮素表观损失量有显著减少,分别比尿素1次施用和分3次施用降低33.40%、28.99%。香蕉苗期使用L粒径CPA与尿素配施,将有助于促进香蕉生长、氮肥吸收利用,减少氮素淋溶和表观损失,增加氮素的残留。
Pot experiments were carried out to study the effects of three kinds of cross-linked polyacrylamide and urea on the growth of banana seedlings and the distribution of nitrogen such as nitrogen uptake, leaching loss, residue and apparent loss. The results showed that the application of urea in combination with CPA could significantly increase the plant height of banana seedlings by an average of 13.19% compared with that of single urea application. The average leaching loss of banana was significantly decreased with an average of Decreased by 15.92%, nitrogen residue increased significantly, an average increase of 13.42%; L particle size (particle size between 1.6 ~ 4.0 mm) CPA with urea can significantly improve the dry matter quality and nitrogen uptake of banana seedlings, Respectively, compared with no CPA treatment increased by 58.42%, 59.86%, with urea three times the application of no significant difference; L particle size CPA with urea treatment significantly reduced the apparent nitrogen loss, respectively, compared with urea and urea The three administrations decreased 33.40% and 28.99% respectively. The use of L particle size CPA and urea at the seedling stage of banana will help to promote banana growth, nitrogen absorption and utilization, reduce nitrogen leaching and apparent loss, and increase nitrogen residue.