Evaluation of the Regional-Scale Optimal K Rate Based on Sustainable Apple Yield and High-Efficiency K Use in Loess Plateau and Bohai Bay of China: A Meta-Analysis

Tang, Wenzheng; Wang, Wenè; DianYu, Chen; Cui, Ningbo; Yang, Haosheng; Hu, Xiaotao

doi:10.3390/agronomy11071368

Cited by 5 publications

(2 citation statements)

References 57 publications

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“…In view of the above, the efficiency of K fertilizers and optimal application rate are the most topical problems [71] since the growers tend to overfertilize with K disregarding the local conditions [69]. To establish the optimal supply rate of plants with K, it is necessary to consider the conditions of a particular orchard: the soil pH, actual soil content, and availability of K and other nutrients.…”

Section: Interactive Effects Of Ions In the Soil On K Uptakementioning

confidence: 99%

Essential Role of Potassium in Apple and Its Implications for Management of Orchard Fertilization

Кузин

Solovchenko

2021

Plants

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K (K) is of paramount importance for apple (Malus × domestica Borkh.), not only for tree growth and development but also for the size and quality of fruit yield. The apple plant’s demand for K varies, along with the progression of phenological phases, during the growing season. The K demand peaks during ripening of fruits featuring relatively high concentration of K comparable to that of the leaves. The mainstream method of apple tree K fertilization is through application of the fertilizer to the soils to improve K uptake by the roots. The bioavailability of K depends on assorted various factors, including pH, interaction with other nutrients in soil solution, temperature, and humidity. An important role in making the K from soil available for uptake by plants is played by plant growth-promoting microorganisms (PGPM), and the specific role of the PGPM is discussed. Advantages of fertigation (the combination of irrigation and fertilization) as an approach include allowing to balance application rate of K fertilizer against its variable demand by plants during the growing season. Excess K in the soil leads to competitive inhibition of calcium uptake by plants. The K-dependent deficiency of Ca leads to its predominant channeling to the leaves and hence to its decline in fruits. Consequently, the apple fruits affected by the K/Ca imbalance frequently develop physiological disorders in storage. This emphasizes the importance of the balanced K application, especially during the last months of the growing season, depending on the crop load and the actual K demand. The potential use of modern approaches to automated crop load estimation through machine vision for adjustment of K fertilization is underlined.

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Section: Interactive Effects Of Ions In the Soil On K Uptakementioning

confidence: 99%

Essential Role of Potassium in Apple and Its Implications for Management of Orchard Fertilization

Кузин

Solovchenko

2021

Plants

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“…The long-term growing of fruit trees without fertilization led to a significant decrease in exchangeable potassium reserves in orchard soil over 6-8 years [14,15]. However, sometimes the rates of potash-containing fertilizers applied in orchards significantly exceed the plant needs for this nutrient [16]. Such excessive fertilization results in the decrease in fertilizers' agronomic efficiency [17].…”

Section: Introductionmentioning

confidence: 99%

The Features of Potassium Dynamics in ‘Soil–Plant’ System of Sour Cherry Orchard

Roeva,

Leonicheva,

Leonteva

et al. 2023

Plants

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This research aimed to study interannual and seasonal dynamics of different potassium compounds in orchard soil and the potassium status of sour cherry trees affected by the application of nitrogen and potash fertilizers. Afield experiment was started in 2017 at an orchard located in the forest-steppe zone of the Central Russian upland. Urea and potassium sulfate were applied to the soil once a year in early spring with rates from N30K40 to N120K160 kg/ha. The content of exchangeable and water-soluble potassium compounds was determined in soil samples five times throughout the growing season from May to September 2018–2020. The content of non-exchangeable potassium was determined twice, in 2017 and 2020. The interannual and seasonal dynamics of plant-available potash in unfertilized soil depended on the weather patterns and the uptake of potassium by trees. In the unfertilized plots, the first signs of potassium nutrition insufficiency appeared, such as low leaf and fruit potassium status and a decrease in the non-exchangeable potassium reserves in the20–40 cm soil layer. The annual fertilization led to the gradual accumulation of exchangeable potassium in the root zone. The accumulation was accelerated with increasing rates. When the exchangeable potassium level in the topsoil reached 200 mg/kg, the intensification of both the seasonal fluctuations in potash content and the potash leaching into the depths of the soil occurred in all treatments. In the conditions of our experiment, one-time treatments with superfluous potassium rates (over 80 kg/ha) did not provide an enlarged stock of plant-available potash in the soil but caused unreasonable losses of it due to leaching. An increase in fertilizer rates was not essential for normal metabolic processes and did not manifest itself as an increase in potassium content in leaves and fruits or as an increase in yield.

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Climate warming may accelerate apple phenology but lead to divergent dynamics in late-spring frost and poor pollination risks in main apple production regions of China

Ru,

Zhou,

Gong

et al. 2023

European Journal of Agronomy

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Evaluation of the Regional-Scale Optimal K Rate Based on Sustainable Apple Yield and High-Efficiency K Use in Loess Plateau and Bohai Bay of China: A Meta-Analysis

Cited by 5 publications

References 57 publications

Essential Role of Potassium in Apple and Its Implications for Management of Orchard Fertilization

Essential Role of Potassium in Apple and Its Implications for Management of Orchard Fertilization

The Features of Potassium Dynamics in ‘Soil–Plant’ System of Sour Cherry Orchard

Climate warming may accelerate apple phenology but lead to divergent dynamics in late-spring frost and poor pollination risks in main apple production regions of China

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