Effect of the Environment-friendly Nutrient Synergist Polyaspartic Acid on the Growth of Poplar Seedlings

doi:10.7525/j.issn.1673-5102.2021.05.009

Abstract

Abstract:

Polyaspartic acid（PASP） is an environment-friendly polymeric substance that has been frequently used as fertilizer synergist and sustained release agent in agriculture. In order to investigate the effects of PASP on nitrogen uptake and utilization in poplar seedlings， 12 gradient treatments of different concentrations of nitrogen and PASP were set in the hydroponic-grown poplar hybrid ‘Nanlin 895’ seedlings. The results showed that the addition of PASP in nutrient solution had an obvious promoting effect on poplar growth and development when nitrogen supply was inadequate， and it improved the plant height， number of leaves and shoot biomass and the utilization efficiency of nitrogen， whereas the root to shoot ratio and nitrate concentration in seedlings was decreased. However， the exogenous supplement of PASP aggravated the stress of high nitrogen under the condition of high nitrogen. The results demonstrated that PASP could be used as fertilizer synergist for poplar， and the appropriate addition of PASP under insufficient nitrogen conditions would promote growth performance of poplar seedlings.

Key words: poplar hybrid ‘Nanlin 895’, polyaspartic acid, nitrate reductase, aspartate aminotransferase, nitrogen use efficiency

CLC Number:

S792.11

Dan CAO, Shi-Zhen WANG, Mei HAN. Effect of the Environment-friendly Nutrient Synergist Polyaspartic Acid on the Growth of Poplar Seedlings[J]. Bulletin of Botanical Research, 2021, 41(5): 712-720.

Figures/Tables 8

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	氮浓度 Nitrogen concentration （mmol·L^-1）	PASP浓度 PASP concentration （mg·L^-1）	供氮量 Nitrogen supply （g/each plant）
1	0	0	0
2	0	100	0
3	0	200	0
4	0.2	0	0.007
5	0.2	100	0.007
6	0.2	200	0.007
7	2	0	0.07
8	2	100	0.07
9	2	200	0.07
10	10	0	0.35
11	10	100	0.35
12	10	200	0.35

氮浓度 Nitrogen concentration （mmol·L^-1）	PASP浓度 PASP concentration （mg·L^-1）	地上部分鲜重 Shoot fresh weight （g）	根鲜重 Root fresh weight （g）	根冠比 Root shoot ratio	株高 Height（cm）	根长 Root length（cm）	叶片数 blade quantity	叶面积 Leaf area（mm^2）
0	0	0.415±0.067d	0.326±0.029b	0.8±0.161a	13.4±0.656d	14.833±1.95ab	6.667±1.528d	797.467±174.363d
0	100	0.897±0.086cd	0.398±0.112b	0.45±0.147bc	16.733±0.874bcd	16.5±4.451a	7.667±1.155cd	1 605±363.736ab
0	200	1.351±0.394c	0.488±0.096b	0.278±0.115de	17.267±2.369bc	15.467±4.1ab	10±0bc	1 384.733±523.014abc
0.2	0	0.949±0.117cd	0.473±0.074b	0.503±0.089b	18.567±1.332ab	15.6±0.755ab	8±1.732cd	1 134.333±75.368bcd
0.2	100	1.459±0.381bc	0.515±0.094b	0.358±0.029bcde	19.667±2.021ab	14.3±3.315abc	10.333±2.517abc	1 650.333±261.041ab
0.2	200	1.364±0.117c	0.424±0.056b	0.311±0.042cde	18.367±2.139ab	15.633±1.656ab	11.667±1.528ab	1 472.667±419.769abc
2	0	1.496±0.236bc	0.424±0.058b	0.284±0.01de	19.2±0.917ab	14.867±2.203ab	11±1ab	1 728.333±219.719a
2	100	2.119±0.709ab	0.569±0.18ab	0.269±0.005e	21.367±4.455a	14.633±0.071ab	13±2.121a	1 440.25±245.704abc
2	200	1.187±0.015abc	0.381±0.071b	0.321±0.056cde	17.35±0.212ab	13.9±0.566ab	11.5±0.707ab	1 428.667±359.78abc
10	0	2.217±0.548a	0.785±0.326a	0.345±0.054cde	18.9±1.345ab	11.167±1.756bcd	12.333±0.577ab	923.433±229.832cd
10	100	0.865±0.261cd	0.362±0.064b	0.433±0.077bcd	14.067±1.242cd	9.167±0.85d	9.667±2.309bc	1 255.333±167.166abc
10	200	1.039±0.362cd	0.351±0.092b	0.344±0.033cde	14±2.358cd	9.933±1.15cd	9.667±1.155bc	1 362.333±300.507abcd

氮浓度 Nitrogen concentration （mmol·L^-1）	PASP浓度 PASP concentration （mg·L^-1）	NUtE （g·g^-1）
0.2	0	28.47±3.51b
0.2	100	43.78±11.421a
0.2	200	40.91±3.504a
2	0	4.488±0.708c
2	100	6.357±1.976c
2	200	4.672±1.927c
10	0	1.33±0.329c
10	100	0.519±0.157c
10	200	0.624±0.217c

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