Nitrogen form plays an important role in the growth of moso bamboo ( Phyllostachys edulis ) seedlings

PeerJ

article

Na Zou¹  Ling Huang¹  Huijing Chen¹  Xiaofeng Huang¹  Qingni Song¹  Qingpei Yang¹  Tianchi Wang³ 

[1] College of Landscape and Art, Jiangxi Agricultural University;Jiangxi Provincial Key Laboratory for Bamboo Germplasm Resources and Utilization, Jiangxi Agricultural University;The New Zealand Institute for Plant & Food Research Limited ,(Plant & Food Research)

关键词: Phyllostachys edulis;    Nitrogen form;    Ammonium;    Nitrate;    Potassium;    Growth response;    Nitrogen concentration;   

DOI  :  10.7717/peerj.9938

学科分类：社会科学、人文和艺术（综合）

来源: Inra

【 摘 要 】

BackgroundThis study aimed to gain an understanding of the growth response of Phyllostachys edulis (moso bamboo) seedlings to nitrogen (N) and potassium (K) to benefit nutrient management practices and the design of proper fertilizer in nursery cultivation.MethodsAn orthogonal array L8(4×24) was used to study the effects of N forms (NH4+, NO3−), N concentrations (8, 32 mmol/L), and K+concentrations (0, 0.5, 1.5, 3 mmol/L) on seedling height, leaf number, chlorophyll content (SPAD value), biomass, root systems, and N content of P. edulis seedlings. Plants were grown in vermiculite under controlled greenhouse conditions.ResultsOur study showed that N form played a significant role in the overall performance of P. edulis seedlings, followed by the effect of N and K+ concentrations. Among the N forms, NH4+ significantly improved the growth of P. edulis seedlings compared with NO3−. Seedling height, leaf number, chlorophyll SPAD value, biomass, and root system architecture (root length, root surface area, root volume, and root tips) were greater with 8 mmol/L of NH4+ treatments than with 32 mmol/L of NH4+treatments, whereas root diameter and N content of P. edulis seedlings were higher with 32 mmol/L of NH4+ than with 8 mmol/L of NH4+. K displayed inconsistent effects on the growth of P. edulis seedlings. Specifically, seedling height, leaf number, biomass and root volume increased when the K+ concentration was increased from 0 to 0.5 mmol/L, followed by a decrease when the K+ concentration was further increased from 0.5 to 3 mmol/L. Root average diameter of the seedlings was the highest with a K+ concentration of 1.5 mmol/L, and K had some inhibitory effects on the chlorophyll SPAD value of the seedlings. P. edulis seedlings performed well with 8 mmol/L NH4+and further tolerated a higher concentration of both NH4+ and NO3−, although excessive N could inhibit seedling growth. A lower concertation of K (≤ 0.5 mmol/L) promoted seedling growth and increasing K+ concentration in the nutrient solution did not alleviate the inhibitory effect of high N on the growth of P. edulis seedlings. Therefore, NH4+nitrogen as the main form of N fertilizer, together with a low concertation of K+, should be supplied in the cultivation and nutrient management practices of moso bamboo.

【 授权许可】

CC BY