title: [Effects of water-nitrogen coupling on leaf nutrient contents of triploid Populus tomentosa clone BT17].
abstract: To understand the coupling effect of water and nitrogen on the leaf nutrient contents of Populus tomentosa and to search for an optimal combination of water and nitrogen for P. tomentosa, a field experiment with randomized block design (3 levels of irrigation water and 4 levels of fertilizer nitrogen) was conducted in a two-year-old P. tomentosa clone BT17 plantation in the nursery of Weixian County, Hebei Province of North China from 2007 to 2009. The N, P and K contents in BT17 leaves differed significantly among seasons, with the order of spring > summer > autumn, and had significant differences among the 12 treatments, being the highest in the treatment 75% of field capacity and 160 g per plant of N application rate. The coupling of water and nitrogen had positive effects on the leaf N, P, and K contents, and thus, more attention should be paid to this coupling effect in the management of P. tomentosa. The leaf nutrient contents had different responses to water and nitrogen. The leaf N and K contents were more affected by soil water content, while the leaf P content was more affected by N application rate.
authors: Ministry of Education Key Laboratory of Soil and Water Conseri9ation and Desertification Combating, Beijing Forestry University, Beijing 100083, China.
authors: Pan-Pan
authors: PP
authors: Luo
authors: Li-Shui
authors: LS
authors: Nie
authors: Ying
authors: Y
authors: Xin
authors: Zhao-Di
authors: ZD
authors: Sun
authors: Zhong-Xiu
authors: ZX
authors: Ren
authors: Dan
authors: D
authors: Wei
mesh_terms: D057914:Agricultural Irrigation / Q000379:methods; D005308:Fertilizers; D009584:Nitrogen / Q000737:chemistry*; D018515:Plant Leaves / Q000737:chemistry*; D011123:Polyploidy; D032107:Populus / Q000737:chemistry* / Q000235:genetics; D014867:Water / Q000032:analysis*
chemical_list: D005308:Fertilizers; D014867:Water; D009584:Nitrogen