Foliar fertilization after onion lodging is feasible, but the fertilization strategy should be formulated based on the specific conditions of the plants and soil environment. The following provides a detailed explanation:

1. Recovery Period After Lodging:

   • After lodging, onion plants enter a recovery phase. The primary goal during this period is to restore root system function, enhance disease resistance, and promote plant growth.
   • During this stage, plants have relatively high nutrient demands. Fertilization can effectively aid in recovery and growth, ultimately improving yield.

2. Role of Foliar Fertilization:

   • Foliar fertilizers are nutrient solutions sprayed directly onto leaves, allowing plants to absorb nutrients quickly.
   • They offer advantages such as ease of application and low required concentrations, enabling rapid replenishment of essential nutrients.

3. Selecting Appropriate Foliar Fertilizers:

   • Choose fertilizers based on their composition and efficacy. Formulations containing macroelements like nitrogen (N), phosphorus (P), and potassium (K), along with micronutrients, are generally suitable for onion growth.
   • Tailor the type of foliar fertilizer (e.g., liquid or suspension formulations) to the plant’s growth stage and soil conditions.

4. Timing and Methods of Application:

   • Apply foliar fertilizers at the start of the recovery period after lodging to accelerate growth.
   • Methods include spraying directly onto leaves or dissolving the fertilizer in water before application.
   • Use appropriate concentrations, as overly diluted or concentrated solutions may reduce absorption efficiency. Follow the recommended dosage on product labels.

5. Precautions:

   • Avoid overapplication, which can lead to nutrient excess and potential root damage.
   • Assess plant health and soil conditions before application to ensure plants are in an optimal growth phase.
   • After application, maintain field management practices such as adequate irrigation and ventilation to enhance nutrient uptake.

Foliar fertilization after onion lodging is permissible but requires a tailored approach based on plant conditions and soil environments. Carefully select fertilizer types, concentrations, and application methods while adhering to best practices. Proper fertilization management promotes recovery, increases yields, and improves crop quality.