Effects of Application Methods of Magnesium Fertilizer on Nutritional Status, Yield and Quality of Honey Pomelo

doi:10.11924/j.issn.1000-6850.casb2022-0924

Abstract

Abstract:

The experiment aims to investigate the effects of magnesium fertilizer application strategies on the nutritional status, yield and quality of pomelo, and the results may provide a theoretical basis for scientific application of magnesium fertilizer in pomelo production. Three magnesium fertilizer treatments were designed, including control (no magnesium fertilizer), soil application of magnesium fertilizer and foliar application of magnesium fertilizer. Results showed that both soil and foliar application of magnesium fertilizer significantly increased the SPAD value, magnesium concentration and nitrogen concentration of the annual spring shoot leaves and biennial spring shoot leaves of pomelo at maturity stage in 2019 and 2020. However, magnesium fertilizer application did not affect the phosphorus, calcium and zinc concentrations of pomelo leaf. Different application methods of magnesium fertilizer generally increased magnesium concentration and nitrogen concentration of honey pomelo pulp. Both soil and foliar application of magnesium fertilizer significantly increased the photosynthetic rate of honey pomelo leaves and foliar application of magnesium also significantly increased the stomatal conductance and transpiration rate of leaves. Compared with the control, the average pomelo yield in two years was increased by 13.8% and 4.1% under foliar application of magnesium and soil application of magnesium fertilizer, respectively. Moreover, foliar application of magnesium significantly increased the Vc concentration, soluble solid concentration and solid-acid ratio of honey pomelo fruit, and soil application of magnesium fertilizer significantly reduced the titratable acid concentration and increased the solid-acid ratio of the fruit for two years. Both Magnesium application methods improved nutritional status of pomelo leaves and fruits, photosynthesis, yield and quality of pomelo. Foliar spraying 4% magnesium sulfate heptahydrate can be recommended as an important practice of magnesium supplementation in the honey pomelo production.

Key words: magnesium, foliar application of magnesium fertilizer, soil application of magnesium fertilizer, honey pomelo, magnesium sulfate

CHEN Jiajie, ZHANG Yan, SHANGGUAN Yilin, WEI Sifan, ZHANG Peng, QIU Aihua, SU Da, SHEN Bingrong, XU Jinxian, YE Delian. Effects of Application Methods of Magnesium Fertilizer on Nutritional Status, Yield and Quality of Honey Pomelo[J]. Chinese Agricultural Science Bulletin, 2023, 39(31): 67-75.

Figures/Tables 12

References 49

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土层/cm	pH	有机质/(g/kg)	速效磷/(mg/kg)	速效钾/(mg/kg)	交换性钙/(mg/kg)	交换性镁/(mg/kg)
0~20	4.71±0.63	17.2±3.20	375±28	67.9±19.6	608±175	95.9±35.1
20~40	4.50±0.51	14.1±2.13	264±18	55.0±16.5	441±155	82.4±28.4

土层/cm	pH	有机质/(g/kg)	速效磷/(mg/kg)	速效钾/(mg/kg)	交换性钙/(mg/kg)	交换性镁/(mg/kg)
0~20	4.71±0.63	17.2±3.20	375±28	67.9±19.6	608±175	95.9±35.1
20~40	4.50±0.51	14.1±2.13	264±18	55.0±16.5	441±155	82.4±28.4

叶片类型	年份	处理	磷浓度/(g/kg)	钾浓度/(g/kg)	钙浓度/(g/kg)	铜浓度/(mg/kg)	锌浓度/(mg/kg)
1年生春梢叶	2019年	CK	1.63±0.18a	23.09±2.36a	28.83±4.85a	11.00±1.97a	22.98±2.75a
		Mg/S	1.50±0.17a	24.19±2.75a	31.94±4.94a	13.17±3.89a	27.42±18.86a
		Mg/L	1.43±0.23a	23.58±3.87a	30.25±5.40a	10.48±0.80a	24.44±6.58a
	2020年	CK	1.46±0.16a	19.42±1.95a	44.22±7.27a	25.55±1.79a	55.61±17.71a
		Mg/S	1.65±0.31a	17.41±2.86ab	36.50±9.63a	20.32±5.52ab	37.93±6.36a
		Mg/L	1.58±0.22a	15.19±2.12b	41.41±2.81a	14.90±3.36b	37.86±9.14a
2年生春梢叶	2019年	CK	1.24±0.11a	19.07±4.32a	36.07±2.32a	35.66±3.67a	27.07±10.2a
		Mg/S	1.11±0.18a	19.43±2.28a	40.75±2.91a	36.05±5.63a	32.41±8.19a
		Mg/L	1.16±0.17a	19.85±1.30a	37.55±4.51a	32.93±8.38a	26.93±1.44a
	2020年	CK	1.13±0.20a	19.45±1.87a	43.02±7.06a	33.58±13.89a	62.26±6.88a
		Mg/S	1.44±0.27a	16.29±0.9b	50.15±7.30a	30.23±7.37a	62.72±5.14a
		Mg/L	1.33±0.19a	14.80±1.66b	51.48±4.54a	31.38±4.3a	56.92±1.77a

叶片类型	年份	处理	磷浓度/(g/kg)	钾浓度/(g/kg)	钙浓度/(g/kg)	铜浓度/(mg/kg)	锌浓度/(mg/kg)
1年生春梢叶	2019年	CK	1.63±0.18a	23.09±2.36a	28.83±4.85a	11.00±1.97a	22.98±2.75a
		Mg/S	1.50±0.17a	24.19±2.75a	31.94±4.94a	13.17±3.89a	27.42±18.86a
		Mg/L	1.43±0.23a	23.58±3.87a	30.25±5.40a	10.48±0.80a	24.44±6.58a
	2020年	CK	1.46±0.16a	19.42±1.95a	44.22±7.27a	25.55±1.79a	55.61±17.71a
		Mg/S	1.65±0.31a	17.41±2.86ab	36.50±9.63a	20.32±5.52ab	37.93±6.36a
		Mg/L	1.58±0.22a	15.19±2.12b	41.41±2.81a	14.90±3.36b	37.86±9.14a
2年生春梢叶	2019年	CK	1.24±0.11a	19.07±4.32a	36.07±2.32a	35.66±3.67a	27.07±10.2a
		Mg/S	1.11±0.18a	19.43±2.28a	40.75±2.91a	36.05±5.63a	32.41±8.19a
		Mg/L	1.16±0.17a	19.85±1.30a	37.55±4.51a	32.93±8.38a	26.93±1.44a
	2020年	CK	1.13±0.20a	19.45±1.87a	43.02±7.06a	33.58±13.89a	62.26±6.88a
		Mg/S	1.44±0.27a	16.29±0.9b	50.15±7.30a	30.23±7.37a	62.72±5.14a
		Mg/L	1.33±0.19a	14.80±1.66b	51.48±4.54a	31.38±4.3a	56.92±1.77a

年份	处理	单株产量/(kg/株)	单株挂果数	单果重/kg
2019年	CK	62.2±2.5b	47±4ab	1.32±0.18a
	Mg/S	64.7±3.4ab	45±2b	1.44±0.09a
	Mg/L	68.9±3.9a	50±2a	1.37±0.10a
2020年	CK	45.1±1.3b	28±2b	1.63±0.19a
	Mg/S	47.0±4.4b	34±4a	1.39±0.10b
	Mg/L	53.2±2.1a	35±1a	1.54±0.07ab