Research on Effect of New Compound Modifier on Properties of Saline-alkali Farmland and Maize Yeld in Tumochuan

doi:10.11924/j.issn.1000-6850.casb2025-0573

Abstract

Abstract:

Aiming at the problems of soil structure degradation and crop growth limitation in saline-alkali farmland in Tumochuan irrigation area of Inner Mongolia, this study explored the mechanism of new compound modifier to improve the yield of silage maize, and provided theoretical basis for ecological improvement of saline-alkali land in semi-arid area. A field experiment was conducted with three treatments: control (CK), single granular amendment (T1), and compound amendment (granular + drip-irrigation amendment, T2). We measured the soil pH, electrical conductivity (EC), saturated hydraulic conductivity (Ks) and other physical and chemical properties in 0-20, 20-40 and 40-60 cm soil layers. Combined with X-ray CT scanning technology, the key pore structure parameters such as soil porosity were quantified, and the yield dynamics of silage maize were monitored simultaneously. The results showed that the compound amendment (T2) treatment significantly improved the cultivated layer structure. Compared with CK, the average weight diameter of 0-20 cm aggregates increased by 75.6%, Ks increased by 99.7%, porosity, pore equivalent volume and Euler number increased by 16.7%, 17.4% and 28.6%, respectively. T2 treatment effectively alleviated saline-alkali stress while enhancing soil nutrient content. During the maize growth period, the average pH across the 0-60 cm soil profile decreased by 6.5%, EC decreased by 67.19%, and soil organic carbon content increased by 4.97%. Ultimately, maize yield under T2 increased significantly, with the fresh weight of silage maize at maturity reaching 57585.82 kg/hm², representing a 120.99% increase over CK and a significant improvement compared to T1. The new compound amendment effectively improves saline-alkali farmland and significantly enhances silage maize yield by synergistically optimizing soil pore structure, reducing soil alkalinity and salinity, which verified its good applicability in the ecological restoration of saline-alkali land in Tumochuan irrigation area.

Key words: saline-alkali soil, soil amendment, soil physical and chemical properties, soil pore structure, crop yield

KONG Lingyu, WU Ze'en, MENG Yunshan, HU Shuwen. Research on Effect of New Compound Modifier on Properties of Saline-alkali Farmland and Maize Yeld in Tumochuan[J]. Chinese Agricultural Science Bulletin, 2025, 41(21): 85-95.

Figures/Tables 16

References 25

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处理	颗粒型改良剂	滴灌型改良剂	缓释掺混肥料	尿素	硫酸钾
CK	0	0	600	300	150
T1	1200	0	600	300	150
T2	1200	225	600	300	150

处理	颗粒型改良剂	滴灌型改良剂	缓释掺混肥料	尿素	硫酸钾
CK	0	0	600	300	150
T1	1200	0	600	300	150
T2	1200	225	600	300	150

土层深度/cm	处理	pH	电导率(EC)/(mS/cm)	全氮(TN)/(g/kg)	全磷(TP)/(g/kg)	全钾(TK)/(g/kg)	有机碳(SOC)/(g/kg)
0~20	CK	8.89±0.02^a	3.46±0.10^a	0.91±0.01^a	0.72±0.02^a	22.63±0.49^a	7.00±0.05^c
	T1	8.45±0.02^b	1.20±0.12^b	0.73±0.01^b	0.72±0.01^a	20.94±0.47^b	7.22±0.12^b
	T2	8.25±0.04^c	0.93±0.07^c	0.70±0.05^b	0.71±0.01^a	20.92±0.07^b	7.45±0.07^a
20~40	CK	8.99±0.02^a	3.27±0.04^a	0.79±0.05^a	0.68±0.03^a	21.63±0.49^a	6.82±0.08^b
	T1	8.46±0.03^b	1.35±0.04^b	0.77±0.03^a	0.69±0.02^a	21.67±0.38^a	7.09±0.06^a
	T2	8.35±0.05^c	1.16±0.04^b	0.77±0.05^a	0.69±0.04^a	21.25±0.46^a	7.20±0.05^a
40~60	CK	9.00±0.03^a	3.41±0.05^a	0.78±0.04^a	0.61±0.04^a	19.23±0.51^a	6.85±0.08^b
	T1	8.47±0.04^b	1.38±0.05^b	0.75±0.06^a	0.64±0.03^a	20.03±0.32^a	6.95±0.06^ab
	T2	8.38±0.02^c	1.23±0.04^c	0.82±0.06^a	0.63±0.02^a	19.79±0.22^a	7.07±0.13^a

土层深度/cm	处理	pH	电导率(EC)/(mS/cm)	全氮(TN)/(g/kg)	全磷(TP)/(g/kg)	全钾(TK)/(g/kg)	有机碳(SOC)/(g/kg)
0~20	CK	8.89±0.02^a	3.46±0.10^a	0.91±0.01^a	0.72±0.02^a	22.63±0.49^a	7.00±0.05^c
	T1	8.45±0.02^b	1.20±0.12^b	0.73±0.01^b	0.72±0.01^a	20.94±0.47^b	7.22±0.12^b
	T2	8.25±0.04^c	0.93±0.07^c	0.70±0.05^b	0.71±0.01^a	20.92±0.07^b	7.45±0.07^a
20~40	CK	8.99±0.02^a	3.27±0.04^a	0.79±0.05^a	0.68±0.03^a	21.63±0.49^a	6.82±0.08^b
	T1	8.46±0.03^b	1.35±0.04^b	0.77±0.03^a	0.69±0.02^a	21.67±0.38^a	7.09±0.06^a
	T2	8.35±0.05^c	1.16±0.04^b	0.77±0.05^a	0.69±0.04^a	21.25±0.46^a	7.20±0.05^a
40~60	CK	9.00±0.03^a	3.41±0.05^a	0.78±0.04^a	0.61±0.04^a	19.23±0.51^a	6.85±0.08^b
	T1	8.47±0.04^b	1.38±0.05^b	0.75±0.06^a	0.64±0.03^a	20.03±0.32^a	6.95±0.06^ab
	T2	8.38±0.02^c	1.23±0.04^c	0.82±0.06^a	0.63±0.02^a	19.79±0.22^a	7.07±0.13^a

处理	苗期	拔节期	抽雄期	灌浆期	成熟期
CK	24.30±2.03^a	74.56±5.88^b	158.34±12.56^b	209.80±20.155^b	212.90±18.24^b
T1	24.60±1.86^a	86.53±4.12^ab	189.32±11.25^a	251.30±16.75^a	256.50±14.53^a
T2	26.70±3.01^a	96.78±6.12^a	212.35±14.36^a	271.60±24.54^a	275.4±21.79^a