Interactions between Soil Water and Fertilizer Application on Fine Root Biomass Yield and Morphology of Catalpa bungei Seedlings

Abstract:

Through a pot experiment using rotatable central composite design (RCCD) with three factors, five levels, twenty runs, fine root biomass yield (BY), total length (TL), surface area (SA) and total volume (TV) of clone 004-1 of Catalpa bungei seedlings under different treatments was determined, and then the mathematical models were established to study the main factor effects, monofactor effect and coupling effects of soil water(W), nitrogen application (N) and phosphorus application (P) on fine root biomass yield and morphological characteristics of C.bungei seedlings. Results showed that N had a significantly positive effect on BY, TL, SA and TV, P had a significantly positive effect on BY, TL and SA, W had a significantly negative effect on TL and SA, and the size sequence of main factor effects was: N> P>W. Monofactor effect analysis results showed that the values of BY, TL, SA and TV first increased and then decreased with N increasing, and BY, TL, SA increased linearly with P increasing. For W, TL, SA decreased linearly and TV first increased and then decreased with W increasing. Interaction of W×N had a significantly positive effect on BY, TL, SA and TV of C. bungei seedlings, and the values of four parameters increased gradually with W and N increasing. However, interactions of W×P, N×P both affected four parameters non-significantly. In conclusion, root biomass and morphological characteristics of C. bungei seedlings showed distinct responses to soil water and fertilizer factors, and W, N and P also influenced fine root growth of C. bungei seedlings differently. We recommended that fine root growth of C. bungei seedlings could be promoted by the rational method combined irrigation and fertilizer application.

• Periodical: Applied Mechanics and Materials (Volume 700)
• Pages: 323-333
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.700.323
• Online since: December 2014
• Authors: Quan Qiu, Ji Yue Li*, Jun Hui Wang, Qian He, Yan Su, Jian Wei Ma
• Keywords: Catalpa bungei, Coupling Effects of Soil Water and Fertilzer, Fertilzer Application, Fine Root Biomass Yield, Fine Root Morphological Characteristic

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