Straw returning and potassium fertilization affect clay mineralogy and available potassium

Chen, Yu Lu; Li, Huang; Cheng, Li Juan; Liu, Zhi Jie; Xue, Bin

doi:10.1007/s10705-023-10284-y

Cited by 4 publications

(3 citation statements)

References 64 publications

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“…Soil particles are the basic structure of the soil porous medium and their composition is closely linked to the physical, chemical, and biological properties of soil. Previous studies have reported that fine particles (clay and powder) are the physical conservators of soil potassium and that the proportion of fine particles is an important factor controlling the variation of soil potassium content [46,47]. Zhuang et al [48] pointed out that during seepage, fine particles migrate between large voids, leading to soil physical erosion, and the loss of potassium ions leads to chemical dissolution.…”

Section: Discussionmentioning

confidence: 99%

Soil Potassium Balance in the Hilly Region of Central Sichuan, China, Based on Crop Distribution

Wang,

Li,

et al. 2023

Sustainability

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The problem of soil fertility imbalance in hilly agriculture is prominent, and accurate estimation of soil potassium balance is key to achieving precision fertilization at the regional level. Crop distribution has a significant impact on potassium balance, but studies on potassium balance with a focus on crop cultivation types are scarce, especially with regard to hilly areas. In this study, the spatial distribution characteristics of soil potassium balance under different cropping conditions and its influencing factors were analyzed for a hilly region. The results showed that (1) the soil rapidly available potassium (RAK) and slowly available potassium (SAK) content in the 0–20 cm soil layer ranged from 29.37 to 122.07 mg kg−1 and from 472.31 to 772.77 mg kg−1, respectively. (2) The soil potassium equilibrium status varied considerably among different cropping systems and the soil potassium deficit was greatest under the rapeseed–maize rotation, reaching −129.50 kg K ha−1 yr−1. The difference in soil potassium deficits between the rice–rapeseed and wheat–maize rotations was not significant, at −46.79 kg K ha−1 yr−1 and −44.07 kg K ha−1 yr−1, respectively, and only the rice–wheat rotation showed a potassium surplus. Due to the low potassium absorption of crops, the equilibrium value of soil potassium is higher than that of crop rotation, and rice and wheat can achieve different degrees of potassium surplus. Rapeseed planting was generally under-applied with potassium, and the potassium deficit could reach −70 kg K ha−1 yr−1. (3) Climate, topography, anthropogenic activity, and soil available potassium explained 20.8% of the variance in soil potassium balance. Anthropogenic activity such as roads and population density had the greatest influence, with 0.797. Topography and average annual precipitation had the weakest influences. These findings emphasize the importance of anthropogenic activity for soil potassium balance, and also provide regional evidence for formulating efficient measures for regional potassium resources management.

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Section: Discussionmentioning

confidence: 99%

Soil Potassium Balance in the Hilly Region of Central Sichuan, China, Based on Crop Distribution

Wang,

Li,

et al. 2023

Sustainability

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“…The high levels of soil test Ca 2+ and Mg 2+ relative to K + in an alkaline soil environment (Table 1) provide evidence to indicate a low rate of K release from the soil despite the high exchangeable STK values. Moreover, phyllosilicate minerals and iron (Fe) oxides in the soil's clay fractions contribute to soil K's unavailability to plants (Chen et al, 2023). Thus, as harvests intensified, alfalfa's demand for K to promote regrowth processes increased and persisted over the cutting frequencies due to its high K needs for production.…”

Section: Forage Accumulationmentioning

confidence: 99%

“…Thus, as harvests intensified, alfalfa's demand for K to promote regrowth processes increased and persisted over the cutting frequencies due to its high K needs for production. Annual additions of K fertilizer therefore maintained a positive K balance, which increased the soil's K pool and the amorphous Fe oxide contents (Chen et al, 2023) to enhance the rate of K release and be readily available for uptake by alfalfa roots. Hence the observation of the response to applied K in a moderateto-high exchangeable K soil environment.…”

Section: Forage Accumulationmentioning

confidence: 99%

Potassium and harvest time interaction effect on alfalfa production and profitability

Baidoo,

Islam

2024

Agronomy Journal

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Researchers have extensively studied and documented the effects of potassium (K) fertility on alfalfa (Medicago sativa L.). Yet, additional research is needed to determine how interactions of K, cultivar, and harvest management influence the K needs of alfalfa. To explore these interactions, we conducted 5 years of field research at the University of Wyoming James C. Hageman Sustainable Agriculture Research and Extension Center in Lingle, WY. Treatments were (a) four K rates (0, 56, 112, and 168 kg K2O ha−1 year−1) applied before planting in the fall of 2016 and after the final harvest in the fall of 2017–2020, (b) two cultivars (Hi‐Gest 360 and AFX 457), and (c) two harvest times (early harvest, late bud to early [10%] bloom, and late harvest, 7 days after early harvest), arranged in a 4 × 2 × 2 factorial under random complete blocks with four replications. At 168 kg K2O ha−1 year−1 and early harvest, a consistently significant (p < 0.05) higher yield response was observed. The same response was seen at 112 kg K2O ha−1 year−1 and late harvest. This occurred at a site with moderate‐to‐high soil K levels throughout the study period. There was a linear (p < 0.001, R2 = 0.66) and quadratic (p = 0.006, R2 = 0.61) response of forage accumulation to K rate at early and late harvest, respectively. Similar trends were also seen for stem count, relative water content, root uptake of K, and tissue K. Time of harvest showed immense potential for optimizing K's effect for a consistent high‐yield response. However, fertilizing alfalfa with 112 kg K2O ha−1 year−1 gave the most profitable production under both harvest times. If K fertilizer prices drop over time, high profits could be attained with higher K fertilization rates. After 3 years of production, average forage accumulation increased under an early harvest system and decreased under a late harvest system. Growers in Wyoming and similar regions are encouraged to consider fertilizing alfalfa with moderate K rates (∼112 kg K2O ha−1 year−1) on soils testing moderate‐to‐high in soil test K, implement a late harvest system for the first 3 years after planting, and transition to an early harvest system after the initial 3 years to maximize alfalfa profits.

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Clay minerals transformation in soil particles of Udic Ferrisols under 36-year Chinese milk vetch application in southern China

Chen,

Huang,

Gao

et al. 2024

Applied Clay Science

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Straw returning and potassium fertilization affect clay mineralogy and available potassium

Cited by 4 publications

References 64 publications

Soil Potassium Balance in the Hilly Region of Central Sichuan, China, Based on Crop Distribution

Soil Potassium Balance in the Hilly Region of Central Sichuan, China, Based on Crop Distribution

Potassium and harvest time interaction effect on alfalfa production and profitability

Clay minerals transformation in soil particles of Udic Ferrisols under 36-year Chinese milk vetch application in southern China

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