Ma Xingzhu, Zhao Yue, Zheng Yu, Wang Lingli, Zhang Yulan, Sun Yi, Ji Jinghong, Hao Xiaoyu, Liu Shuangquan, Sun Nan
Heilongjiang Academy of Agricultural Sciences, Harbin 150086, China.
Heilongjiang Academy of Black Soil Conservation and Utilization, Harbin 150086, China.
Plants (Basel). 2025 Mar 5;14(5):810. doi: 10.3390/plants14050810.
Fertilization is a key management practice for maintaining or improving soil fertility and ensuring grain yield in agro-ecosystems. Nevertheless, as a low-yield soil, how fertilization strategies impact the status of albic soil physical and chemical properties, biological activity, and crop yield are poorly understood. Through a two-year positioning experiment, the albic soil fertility characteristics (physical, chemical, and biological) and changes in maize yield under different fertilization were studied. Three treatments were established: (1) conventional fertilization (chemical fertilizer) (T1), (2) optimized fertilization 1 (low amount of organic fertilizer + chemical fertilizer) (T2), and (3) optimized fertilization 2 (high amount of organic fertilizer + chemical fertilizer) (T3). The results indicated that, compared with T1, the soil bulk density of T2 and T3 treatments decreased, the average solid phase ratio of soil decreased by 8.2%, and the average liquid and gas phase ratios increased by 7.2% and 10.2%, respectively. The soil organic matter (SOM) and soil organic carbon storage (SOCS) under treatment of optimized fertilization were significantly higher than under T1, with an average increase of 10.1% for SOM and 8.8% for SOCS, respectively. T3 significantly increased the contents of alkali-hydrolyzable nitrogen, available phosphorus, and available potassium, while different fertilizations had little effect on soil pH. T2 and T3 significantly increased activities of soil urease, sucrase, phosphatase, and catalase, with an average increase of 33.7%, 56.9%, 32.0%, and 6.7%, respectively. The numbers of soil bacteria and actinomycetes under T3 increased significantly by 30.2% and 22.0% compared to T1, while the number of fungi decreased by 6.7%. The total number of soil microorganisms increased significantly by 29.0% of T3, and the proportion of soil bacteria to the total number of microorganisms increased, while the proportion of fungi and actinomycetes decreased. The maize yield of T3 was significantly higher than under other treatments, with an increase of 2368.5 kg/ha compared to T1. Correlation analysis showed that the contents of available nutrients and organic matter, the numbers of soil bacteria and actinomycetes, and the activities of soil urease and phosphatase had the most significant impact on maize yield. The optimized fertilization, which was the organic fertilizer combined with chemical fertilizer, can improve the physical properties of albic soil, increase soil organic matter content, organic carbon storage, available nutrient content, and soil biological activity, also for maize yield. Therefore, the optimized fertilization in albic soil of Northeast China is a promising and important management option for improved soil quality and grain yield. This work provides a theoretical basis and technical reference for efficient fertilization.
施肥是农业生态系统中维持或提高土壤肥力以及确保粮食产量的关键管理措施。然而,作为一种低产土壤,施肥策略如何影响白浆土的理化性质、生物活性及作物产量,目前仍知之甚少。通过为期两年的定位试验,研究了不同施肥处理下白浆土的肥力特征(物理、化学和生物)及玉米产量变化。设置了三个处理:(1)常规施肥(化肥)(T1);(2)优化施肥1(少量有机肥+化肥)(T2);(3)优化施肥2(大量有机肥+化肥)(T3)。结果表明,与T1相比,T2和T3处理的土壤容重降低,土壤平均固相率降低了8.2%,液相和气相平均比率分别提高了7.2%和10.2%。优化施肥处理下的土壤有机质(SOM)和土壤有机碳储量(SOCS)显著高于T1处理,SOM平均增幅为10.1%,SOCS平均增幅为8.8%。T3显著提高了碱解氮、有效磷和速效钾的含量,而不同施肥处理对土壤pH影响较小。T2和T3显著提高了土壤脲酶、蔗糖酶、磷酸酶和过氧化氢酶的活性,平均增幅分别为33.7%、56.9%、32.0%和6.7%。与T1相比,T3处理下的土壤细菌和放线菌数量分别显著增加了30.2%和22.0%,而真菌数量减少了6.7%。T3处理下的土壤微生物总数显著增加了29.0%,土壤细菌占微生物总数的比例增加,而真菌和放线菌的比例降低。T3处理的玉米产量显著高于其他处理,比T1增产2368.5 kg/公顷。相关性分析表明,速效养分和有机质含量、土壤细菌和放线菌数量以及土壤脲酶和磷酸酶活性对玉米产量影响最为显著。有机肥与化肥相结合的优化施肥能够改善白浆土的物理性质,增加土壤有机质含量、有机碳储量、速效养分含量及土壤生物活性,进而提高玉米产量。因此,中国东北白浆土的优化施肥是改善土壤质量和提高粮食产量的一种有前景且重要的管理措施。本研究为高效施肥提供了理论依据和技术参考。