1、Foliar Fertilization for Sustainable Crop Production
Here I review the extensive work that has been carried out on the effectiveness of foliar-applied nutrients, the mechanisms of foliar absorption, and transport.
2、Foliar application of zinc sulphate and zinc EDTA to wheat leaves: differences in mobility, distribution, and speciation
The results of the present study provide important insights into the behaviour of commonly used foliar-applied Zn fertilizers, and can be used to optimize current fertilization strategies and contribute to the development of more efficient foliar Zn fertilizers.
3、Phosphate foliar application increases biomass and P concentration in P deficient maize
Uptake occurred on both sides of the leaf with no significant differences. Conclusions: Maize plants are able to absorb and utilize foliar-applied P, even under deficient conditions and independently of leaf side. P foliar application can therefore be used as a top-up application in deficiency situations.
4、Effect of Foliar Applied Urea on Growth and Yield of Sunflower (Helianthus annuus L.)
Similarly, foliar fertilization is very useful to fulfil the plant requirement for various macro and micronutrients. Foliar fertilizers immediately deliver nutrients to the tissues and organs of the crop. This is a practice of applying liquid fertilizers to leaves.
5、Nanotechnology promotes the R&D of new
Foliar fertilizers have attracted increasing attention over the last few decades as they offer the most efficient way to correct micronutrient deficiencies and enhance the product yield and quality of crops and plants.
The effects of foliar fertilization with iron sulfate in chlorotic leaves are limited to the treated area. A study with peach trees
In the basal, untreated leaf parts, Fe concentrations increased slightly, but little re-greening occurred. No changes in the concentrations of other nutrients were found. Foliar Fe fertilization was effective in re-greening treated leaf areas both in peach trees and sugar beet plants.
Foliar nutrient applications to ‘Wonderful’ pomegranate (Punica granatum L.). II. Effects on leaf nutrient status and fruit split, yield
Foliar applications of KNO 3 resulted in significant increases in leaf N and K concentrations and foliar MgSO 4 resulted in a significant increase in leaf S concentration. All foliar fertilizer types resulted in significantly lower fruit split incidence at one of the study sites.
Foliar Fertilization of Crop Plants: Journal of Plant Nutrition: Vol 32 , No 6
Soil applications of fertilizers are mainly done on the basis of soil tests, whereas foliar nutrient applications are mainly done on the basis of visual foliar symptoms or plant tissue tests. Hence, correct diagnosis of nutrient deficiency is fundamental for successful foliar fertilization.
COMPARISON OF DIFFERENT FOLIAR
Foliar fertilization is a rapid, efficient way to improve crop nutrient status during periods of high nutrient demand or when soil conditions (low tempera-ture, salinity, pH) render soil nutrients and soil-applied fertilizers less available to the plant’s roots.
Effect of foliar application of urea on the growth and yield of tomato
Results showed that different yield components and yield of tomato were influenced by the foliar application of different concentrations of urea.
Foliar fertilizers that promote leaf enlargement and thickening are designed to be directly absorbed by plant leaves, enhancing leaf growth, increasing thickness, and improving overall plant health. These fertilizers typically contain essential nutrients such as nitrogen (N), phosphorus (P), and potassium (K), which are critical for plant development. Below are some common foliar fertilizers and their functions:
1. Balanced Compound Fertilizers
Balanced compound fertilizers are among the most widely used foliar treatments. They provide all major nutrients required for plant growth, with adjustable ratios to suit specific needs. These fertilizers enable rapid nutrient absorption, promoting leaf growth and thickening. For example, Schneider’s "All-Purpose" series offers a balanced blend of N, P, K, and micronutrients.
2. Water-Soluble Fertilizers
Water-soluble fertilizers are liquid formulations that dissolve easily in water, allowing for quick absorption and transport within plants. Compared to solid fertilizers, they offer higher concentrations of active ingredients, rapidly boosting nutrient levels. A notable example is the "S-40" series by Shile, a highly efficient water-soluble foliar fertilizer.
3. Micronutrient Fertilizers
Certain micronutrients, such as boron (B), manganese (Mn), zinc (Zn), and copper (Cu), are essential for plant growth but may be limited in soil availability. Foliar spraying of micronutrient fertilizers ensures plants receive adequate amounts of these critical elements.
4. Organic Foliar Fertilizers
Though less potent than chemical alternatives, organic foliar fertilizers are environmentally friendly and safe for use. Derived from natural sources like seaweed extracts, animal fats, or plant extracts, they provide essential nutrients while minimizing soil and environmental impact.
5. Biostimulants
Biostimulants contain microorganisms or plant extracts designed to stimulate growth and metabolism. For instance, rhizobia improve root health, while plant extracts like capsaicin enhance growth vigor.
6. Photosynthesis Promoters
These fertilizers enhance photosynthetic efficiency, boosting overall growth and yield. Rich in phosphorus, potassium, and micronutrients like iron (Fe), they improve nutrient absorption and leaf development.
7. Disease-Resistant Growth Promoters
Formulated to prevent plant diseases while stimulating growth, these fertilizers often contain antimicrobial components like antibiotics or natural compounds. Fulvic acid substances, for example, are commonly used for their disease-resistant properties.
Key Considerations for Selection and Use:
- Target Plant: Different species require tailored nutrient profiles.
- Growth Stage: Formulas may vary for seedlings, flowering, or maturity stages.
- Soil Conditions: Soil pH, texture, and nutrient status influence fertilizer choice.
- Climate: Environmental factors dictate dosage and type.
- Environmental Impact: Prioritize eco-friendly options to reduce harm.
proper foliar fertilization can effectively enhance leaf size, thickness, and plant health. excessive or improper use may disrupt growth balance. Always follow recommended dosages and application methods to optimize results.
