Study on Seasonal Variation and Nutrient Elements Correlations in Green Pomelo Leaves

doi:10.11924/j.issn.1000-6850.casb2024-0159

Abstract

Abstract:

The paper aims to study the seasonal dynamic characteristics of N, P, K, Ca, Mg, Cu, Fe, Mn and Zn elements in mature green pomelo leaves and the correlations between them. Using the 3 and 6-year old mature green pomelo forest as investigation subject, samples were collected 1 time around every month to determine the nutrient element content in mature leaves, the seasonal variation characteristics were analyzed, and the correlations between the elements were evaluated. The result showed that the contents of nutrient elements in the leaves of two different age green pomelo were basically the same. Large and medium amounts of nutrient element annual contents in mature leaves of green pomelo were arranged in the following order: Ca> N> K> Mg> P, while the content of trace elements were arranged in the following order: Fe>Mn>Zn>Cu. There were obvious differences in the contents of each nutrient element in the whole growth period. The variation of K in content of macro-elements and mid-elements was the largest, and the variation of Cu in content of micro-elements was the largest. The contents of 9 nutrient elements changed regularly with the seasons, and the changing trend of trees at two different ages was almost identical. There are mutually promoting or antagonistic relations among various nutrient elements in the leaves of green pomelo. The results can provide theoretical basis for scientific fertilization in proper time, suitable fertilizer and proper amount in cultivation of green pomelo.

Key words: green pomelo, leaf, nutrient elements, seasonal variation, correlation, scientific fertilization

CHEN Hongjie, ZHANG Jianchun. Study on Seasonal Variation and Nutrient Elements Correlations in Green Pomelo Leaves[J]. Chinese Agricultural Science Bulletin, 2024, 40(34): 83-88.

Figures/Tables 12

References 26

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树龄	项目	大量元素			中量元素		微量元素
树龄	项目	N/%	P/%	K/%	Ca/%	Mg/%	Cu/(mg/kg)	Fe/(mg/kg)	Mn/(mg/kg)	Zn/(mg/kg)
3 a	年平均	2.33±0.15	0.15±0.03	1.83±0.45	6.71±1.57	0.26±0.03	24.78±6.40	142.71±25.37	37.81±6.86	25.22±4.36
3 a	变异系数/%	6.44	20.00	24.59	23.39	11.54	25.83	17.78	18.14	17.29
6 a	年平均	2.40±0.17	0.14±0.03	1.61±0.40	5.39±1.20	0.32±0.04	24.37±5.98	159.33±26.68	47.89±4.83	30.12±3.50
6 a	变异系数/%	7.08	21.43	24.84	22.26	12.50	24.54	16.74	10.08	11.62

树龄	项目	大量元素			中量元素		微量元素
树龄	项目	N/%	P/%	K/%	Ca/%	Mg/%	Cu/(mg/kg)	Fe/(mg/kg)	Mn/(mg/kg)	Zn/(mg/kg)
3 a	年平均	2.33±0.15	0.15±0.03	1.83±0.45	6.71±1.57	0.26±0.03	24.78±6.40	142.71±25.37	37.81±6.86	25.22±4.36
3 a	变异系数/%	6.44	20.00	24.59	23.39	11.54	25.83	17.78	18.14	17.29
6 a	年平均	2.40±0.17	0.14±0.03	1.61±0.40	5.39±1.20	0.32±0.04	24.37±5.98	159.33±26.68	47.89±4.83	30.12±3.50
6 a	变异系数/%	7.08	21.43	24.84	22.26	12.50	24.54	16.74	10.08	11.62

等级	N/%	P/%	K/%	Ca/%	Mg/%	Cu/(mg/kg)	Fe/(mg/kg)	Mn/(mg/kg)	Zn/(mg/kg)
缺乏	[0, 2.5)	[0, 0.1)	[0, 0.7)	[0, 1.6)	[0, 0.2)	[0, 3)	[0, 35)	[0, 18)	[0, 18)
低量	[2.5, 2.7)	[0.10, 0.12)	[0.7, 1.2)	[1.6, 3.0)	[0.2, 0.25)	[3, 5)	[35, 60)	[18, 25)	[18, 25)
适量	[2.7, 3.0)	[0.12, 0.16)	[1.2, 1.7)	[3.0, 5.5)	[0.25, 0.50)	[5, 16)	[60, 120)	[25, 100)	[25, 100)
高量	[3.0, 3.2)	[0.16, 0.30)	[1.7, 2.0)	[5.5, 7.0)	[0.50, 0.70)	[16, 20)	[120, 200)	[100, 300)	[100, 300)
过量	[3.2, +∞)	[0.30, +∞)	[2.0, +∞)	[7.0, +∞)	[0.70, +∞)	[20, +∞)	[200, +∞)	[300, +∞)	[300, +∞)

等级	N/%	P/%	K/%	Ca/%	Mg/%	Cu/(mg/kg)	Fe/(mg/kg)	Mn/(mg/kg)	Zn/(mg/kg)
缺乏	[0, 2.5)	[0, 0.1)	[0, 0.7)	[0, 1.6)	[0, 0.2)	[0, 3)	[0, 35)	[0, 18)	[0, 18)
低量	[2.5, 2.7)	[0.10, 0.12)	[0.7, 1.2)	[1.6, 3.0)	[0.2, 0.25)	[3, 5)	[35, 60)	[18, 25)	[18, 25)
适量	[2.7, 3.0)	[0.12, 0.16)	[1.2, 1.7)	[3.0, 5.5)	[0.25, 0.50)	[5, 16)	[60, 120)	[25, 100)	[25, 100)
高量	[3.0, 3.2)	[0.16, 0.30)	[1.7, 2.0)	[5.5, 7.0)	[0.50, 0.70)	[16, 20)	[120, 200)	[100, 300)	[100, 300)
过量	[3.2, +∞)	[0.30, +∞)	[2.0, +∞)	[7.0, +∞)	[0.70, +∞)	[20, +∞)	[200, +∞)	[300, +∞)	[300, +∞)

树龄	指标	N	P	K	Ca	Mg	Cu	Fe	Mn
3 a	P	-0.665^*	1
	K	-0.521	0.770^**	1
	Ca	-0.663^*	0.747^**	0.669^*	1
	Mg	-0.087	0.319	-0.184	0.307	1
	Cu	0.053	0.296	0.099	0.537	0.693^*	1
	Fe	-0.641^*	0.498	0.569	0.727^**	-0.266	-0.004	1
	Mn	0.326	-0.223	-0.542	-0.072	0.483	0.501	-0.306	1
	Zn	0.064	-0.187	-0.592	-0.018	0.690^*	0.201	-0.320	0.477
6 a	P	-0.605^*	1
	K	-0.581^*	0.730^**	1
	Ca	-0.631^*	0.771^**	0.430	1
	Mg	0.000	-0.092	-0.399	0.382	1
	Cu	-0.430	0.377	0.050	0.672^*	0.670^*	1
	Fe	-0.473	0.619^*	0.290	0.770^**	0.627^*	0.808^**	1
	Mn	-0.162	0.456	-0.124	0.648^*	0.537	0.728^**	0.750^**	1
	Zn	-0.003	-0.236	-0.465	0.304	0.705^*	0.529	0.284	0.335