1、Effects of different rates of nitrogen fertilizer on apple yield, fruit

Farmers′ rampant use of N fertilizer is imperiling apple production in China. Nitrogen (N) and water deficiency jointly limit apple production in semiarid apple-producing regions worldwide.

2、不同增效氮肥对苹果生长、氮素利用率和土壤氮素供应能力

为比较不同增效氮肥对苹果生长的影响,筛选适宜苹果施用的增效氮肥及施用方法,研究了4种不同增效氮肥对苹果生长、产量、品质及土壤氮素供应能力的影响。 试验共设7个处理:不施氮肥 (CK)、农民常规施用普通尿素 (U)、包膜尿素与普通尿素3∶7掺混 (CU1)、基施包膜尿素追施普通尿素 (CU2)、控失尿素 (KSU)、稳定性尿素 (WDU)、腐植酸稳定性尿素 (FZU)。 在山东栖霞市布设田间试验,供试品种为6年生苹果金冠。 结果表明,施用不同增效氮肥可显著促进春梢与秋梢生长,提高叶片SPAD、苹果产量与品质,其中FZU处理较U处理的产量显著提高了8.89%,CU1处理较U处理的果实Vc含量显著提高66.73%,CU1处理对春梢与秋梢的生长量的提高效果最明显。

3、滴灌施肥下氮肥类型对苹果树生长及产量品质的影响

In this study, three different types of nitrogen fertilizers, urea (U), urea ammonium nitrate liquid fertilizer (UAN), and urea + calcium ammonium nitrate (UCAN), were used in a two|year drip fertigation trial with densely planted dwarf apple trees as the research object to investigate the effects of different nitrogen fertilizer ...

4、Effects of Water and Nitrogen Regulation on Apple Tree Growth

Apple tree productivity is influenced by the quantity of water and nutrients that are supplied during planting. To enhance resource utilization efficiency and optimize yields, a suitable strategy for supplying water and nitrogen must be established.

5、Effects of different rates of nitrogen fertilizer on apple yield

Nitrogen (N) and water deficiency jointly limit apple production in semiarid apple-producing regions worldwide.

Distinguishing the contribution of nitrogen fertilizer and native soil

Native soil N, not chemical fertilizer, is the primary N source in young apple orchards. A better balance of N fertilizer inputs, native soil N supply, and N demand for apple trees is needed to minimize associated environmental impacts.

Nitrogen Use Efficiency, Allocation, and Remobilization in Apple Trees

We investigated how the timing of N application affected uptake, allocation, and remobilization within 14-year-old “Gala”/M26 apple trees (Malus domestica Borkh) over two seasons.

Optimizing irrigation and nitrogen fertilizer management to improve

Inappropriate strategies in water use and nitrogen (N) fertilizer application in apple production can decrease apple yield, water productivity (WP), nitrogen use efficiency (NUE), and quality, leading to severe environmental pollution.

Effects of different rates of nitrogen fertilizer on apple yield, fruit

This paper studied the effect of nitrogen fertilizer on water use efficiency (WUE) and relevant parameters of two years old potted apple trees (Starkrimson/Malus hupenensis) under...

[Effects of different integration of water and fertilizer modes on the

In summary, nitrogen application by percolation irrigation (subsurface application) significantly promoted leaf growth and nitrogen utilization of apple tree, and improved fruit yield and quality.

Nitrogen fertilizer is a commonly used agricultural input that plays a critical role in the growth and development of apple trees. Its functions and effects primarily manifest in the following aspects:

1. Promoting Growth: Nitrogen fertilizer supplies essential nitrogen nutrients for plant growth, fostering the development of apple trees. Nitrogen is a key component of proteins, nucleic acids, chlorophyll, and other vital substances in plants, directly influencing their growth. Appropriate application of nitrogen fertilizer accelerates shoot elongation, increases fruit quantity, and enhances fruit quality.

2. Improving Photosynthetic Efficiency: Nitrogen fertilizer boosts the photosynthetic capacity of leaves, leading to greater accumulation of photosynthates and higher net photosynthetic rates. This is particularly crucial for apple trees, which require abundant nutrients to sustain growth. Enhanced photosynthesis enables trees to absorb more nutrients, improving stress resistance and adaptability.

3. Facilitating Flower Bud Differentiation: Nitrogen fertilizer promotes flower bud formation, increasing both the number and quality of buds. Adequate nitrogen supply during this critical stage ensures successful flower bud development. Additionally, it enhances pollen germination and tube growth, raising pollination and fertilization rates, thereby boosting fruit yield.

4. Enhancing Stress Resistance: Nitrogen strengthens the tree’s ability to resist diseases and pests. As a regulator of immune responses, proper nitrogen application improves tolerance to adverse conditions (e.g., drought, low temperatures). For instance, nitrogen fertilizer can enhance water use efficiency and cold resistance, reducing the incidence of pests and diseases.

5. Improving Fruit Quality: Nitrogen fertilizer positively impacts fruit characteristics. It increases flesh firmness, sugar content, and overall quality. Furthermore, it promotes skin coloration and flavor compound synthesis, enhancing the appearance and taste of apples.

6. Promoting Soil Nutrient Cycling: Through microbial nitrification and denitrification, nitrogen fertilizer facilitates the transformation and recycling of soil nitrogen. This sustains soil fertility, reduces chemical fertilizer reliance, and lowers environmental pollution risks.

nitrogen fertilizer is indispensable for the healthy growth and high-quality yields of apple trees. Proper application supports development, photosynthesis, flowering, stress resistance, fruit quality, and soil health. Thus, rational nitrogen management is a cornerstone of sustainable apple production.