Effects of Phosphorus Levels on Root Morphology and Plant Growth of Alfalfa Seedlings

doi:10.6048/j.issn.1001-4330.2023.03.027

Abstract

Abstract:

【Objective】 Low soil available phosphorus content is one of the main factors restricting crop growth. This project aims to clarify the effect of phosphorus level on alfalfa root morphology and plant growth in the hope of providing a theoretical basis for the study of alfalfa tolerant mechanisms. 【Methods】 In this experiment, under hydroponic conditions, six kinds of phosphorus were analyzed, which were 0 umol/L (P₁), 50 umol/L (P₂), 100 umol/L (P₃), 250 umol/L (P₄), 500 umol/L (P₅), 1000 umol/L (P₆) levels affecting the root characteristics, plant growth and nutrient accumulation of Xinmu 1 alfalfa at the seedling stage.【Results】 With the increase of phosphorus level, the root-to-shoot ratio decreased significantly (P<0.05), and the biomass first increased and then decreased. Except for the P₄ and P₅ treatments, there was no significant difference in plant height (P<0.05), and there was no significant difference among other treatments (P<0.05). The plant height was the highest under P₄ treatment, which was 9.37 cm; the total root length, root surface area and root-to-shoot ratio reached the maximum under P₂ phosphorus supply level, which were 281.75 cm, 20.78 cm², and 1.13; 6 species, under the phosphorus level, the accumulation of nitrogen, phosphorus, and potassium in the ground were greater than the accumulation in the ground, and comprehensive comparison showed that the P₅ treatment was more conducive to alfalfa growth. 【Conclusion】 Low phosphorus concentration can promote the growth of alfalfa roots, while excessively high phosphorus concentration inhibits its growth, reduces plant height, total root length, root surface area and root-to-shoot ratio.

Key words: phosphorus level; alfalfa; root traits; nutrient accumulation

摘要：

【目的】研究磷水平对苜蓿根系形态和植株生长的影响,为苜蓿耐低磷机制的研究提供理论依据。【方法】在水培条件下,分析6种磷:0 μmol/L(P₁),50 μmol/L(P₂),100 μmol/L(P₃),250 μmol/L(P₄),500 μmol/L(P₅),1 000 μmol/L(P₆)水平对新牧1号苜蓿苗期根系性状、植株生长及养分积累的影响。【结果】随磷水平增加,根冠比显著降低(P<0.05),生物量先增加后减少,除P₄、P₅处理下株高无显著(P<0.05)差异外,其他各处理间均存在显著(P<0.05)差异,P₄处理下株高最高,为9.37 cm;P₂供磷水平下总根长、根表面积与根冠比均达到最大,分别为281.75 cm、20.78 cm²、1.13;6种磷水平下,地下部氮、磷、钾积累量均大于地上部积累量,P₅处理时更有利于苜蓿生长。【结论】低磷浓度能促进苜蓿根系生长,过高磷浓度则会抑制苜蓿生长,使植株高度下降,总根长、根表面积以及根冠比降低。

关键词: 磷水平, 苜蓿, 根系性状, 养分积累

CLC Number:

S551.7

MA Hong, MENG Jie, LI Ning. Effects of Phosphorus Levels on Root Morphology and Plant Growth of Alfalfa Seedlings[J]. Xinjiang Agricultural Sciences, 2023, 60(3): 750-756.

马红, 孟捷, 李宁. 磷水平对新牧1号苜蓿苗期根系形态和植株生长的影响[J]. 新疆农业科学, 2023, 60(3): 750-756.

Figures/Tables 3

References 25

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元素 Elements	化合物(分析纯) Compounds(AR)	含量 Concentration
大量元素 Major elements	四水硝酸钙 Ca(NO₃)₂·4H₂O	945 mg/L
	硝酸钾 KNO₃	506 mg/L
	硝酸铵 NH₄NO₃	80 mg/L
	硫酸镁 MgSO₄·7H₂O	493 mg/L
铁盐溶液 Na₂Fe-EDTA	七水硫酸亚铁 FeSO₄·7H₂O	5.56 g/L
铁盐溶液 Na₂Fe-EDTA	乙二胺四乙酸二钠 EDTA·Na	7.46 g/L
微量元素 Trace elements	碘化钾 KI	0.83 mg/L
	硼酸 H₃BO₃	6.2 mg/L
	硫酸锰 MnSO₄·4H₂O	22.3 mg/L
	硫酸锌 ZnSO₄·7H₂O	8.6 mg/L
	钼酸钠 Na₂MoO₄·2H₂O	0.25 mg/L
	硫酸铜 CuSO₄·5H₂O	0.025 mg/L
	氯化钴 CoCl₂·6H₂O	0.025 mg/L

元素 Elements	化合物(分析纯) Compounds(AR)	含量 Concentration
大量元素 Major elements	四水硝酸钙 Ca(NO₃)₂·4H₂O	945 mg/L
	硝酸钾 KNO₃	506 mg/L
	硝酸铵 NH₄NO₃	80 mg/L
	硫酸镁 MgSO₄·7H₂O	493 mg/L
铁盐溶液 Na₂Fe-EDTA	七水硫酸亚铁 FeSO₄·7H₂O	5.56 g/L
铁盐溶液 Na₂Fe-EDTA	乙二胺四乙酸二钠 EDTA·Na	7.46 g/L
微量元素 Trace elements	碘化钾 KI	0.83 mg/L
	硼酸 H₃BO₃	6.2 mg/L
	硫酸锰 MnSO₄·4H₂O	22.3 mg/L
	硫酸锌 ZnSO₄·7H₂O	8.6 mg/L
	钼酸钠 Na₂MoO₄·2H₂O	0.25 mg/L
	硫酸铜 CuSO₄·5H₂O	0.025 mg/L
	氯化钴 CoCl₂·6H₂O	0.025 mg/L