Feed The Leaves

Feed The Leaves

Foliar feeding is not intended to completely replace soil-applied fertilization of the macronutrients (nitrogen, potassium, and phosphorous). However, macronutrients can be foliarly applied in sufficient quantities to influence both fruit yield and quality. Some crops, like citrus, can have a large part of the nitrogen, potassium, and phosphorous requirements met through foliar applications.

Foliar applications of other plant nutrients (calcium, magnesium, and sulfur) and micronutrients (zinc, manganese, copper, boron, and molybdenum) have proven for many crops to be an excellent means for supplying the plants’ requirements. Soil application of magnesium, manganese, zinc, boron, and molybdenum is not as economical and not as effective as foliar application to supply those nutrients to citrus trees. Applications made to the soil can be subject to leaching, volatilization, and/or being tied up by soil particles in unavailable forms to plants.

Foliar Flexibility

Foliar feeding should be used as an integral part of the annual nutritional program. It can be used in other situations to help plants through short, but critical periods of nutrient demand, such as fruit set and bud differentiation. Foliar nutrition also may prove to be useful at times of soil or environmentally induced nutritional shortages. Leaf application of nutrients is of significant importance when the root system is unable to keep up with crop demand or when the soil has a history of problems that inhibit normal growth.

Foliar feeding is proven to be useful under prolonged spells of wet soil conditions, dry soil conditions, calcareous soil, cold weather, or any other condition that decreases the tree’s ability to take up nutrients when there is a demand. It also may be utilized effectively when a nutritional deficiency is diagnosed. A foliar application is the quickest method of getting the most nutrients into plants. However, if the deficiency can be seen, the crop might have already lost some potential yield.

Several Florida citrus growers and production managers are using foliar nutritional sprays, mainly micronutrients, to slow down decline and maintain adequate fruit productivity of citrus greening-infected trees. Supplemental, balanced foliar nutrition has positive effects on plant diseases by inducing naturally occurring plant resistance mechanisms. It is always important to maintain the balance between nutrients because having one nutrient significantly out of balance can be as bad as a deficiency.

Burn Notice

While foliar feeding has many advantages, it can burn plants at certain rates under certain environmental conditions. It is important to follow the established guidelines for applications. There are a number of conditions that can increase the chances of causing foliar burn. A plant under stress is more susceptible to damage. Stressful conditions include drying winds, disease infestations, and poor soil conditions. The environmental conditions at the time of application also are important factors. Applications when the weather is warm (above 80°F) should be avoided. This means that during warm seasons, applications should be made in the morning or evening.

Additionally, applications should not be at less than two-week intervals to give the plant sufficient time to metabolize the nutrients and deal with the added osmotic stress.

Another important factor when applying nutrients foliarly is to ensure that the pH of the material is in the proper range. The pH range of the spray solution should be between six and seven. Attention should be paid to the pH of the final spray solution. This is significant in areas where water quality is poor.

Post-bloom foliar applications (applied in April when the spring flush leaves are about fully expanded) of potassium nitrate or mono-potassium phosphate have been found to increase fruit yield and size (8 lb. K2O per acre per application).

Leave a Reply

Featured Stories
Crop ProtectionResources For Knowing Your Soil
July 30, 2015
Getting to know your soil and learning other environmental and natural resources data can be downloaded and is available for use with many computer software platforms for general resource analysis and farm management. Read More
money
CitrusBankrupt Florida Farm To Yield Plenty Of Land, Equipment In Upcoming Auction
July 30, 2015
As many as seven different buyers could be part of this Chapter 11 proceeding. Read More
Sanjay Shukla
ProductionGeometrically Speaking, Thinking Smaller Might Produce Big Savings For Vegetable Growers
July 30, 2015
University of Florida scientist develops compact planting bed formula that cuts water, fertilizer, and pesticide use in half. Read More
GrapesDrought’s Impact On California Winegrapes
July 30, 2015
The impact is minimal this year, but the future is uncertain if the drought continues. Read More
Apples & PearsEPA Approves New 1-MCP Technology
July 30, 2015
EPA approved Fysium, a new 1-MCP product from Pace International LLC. Considered new technology, this product is produced on-site by Read More
Crop ProtectionNew Fungicide Targets Key Diseases
July 30, 2015
This disease control tool hits two different parts of the fungal life cycle. Read More
CitrusWestern Growers Praises Introduction Of California Emergency Drought Relief Act
July 30, 2015
Legislation contains short- and long-term provisions to deal with the historic drought. Read More
Farm ManagementFour Great Pricing Tips From U-Pick Experts
July 30, 2015
Although each of the growers I talked to has his or her own take on a pricing structure, they all Read More
BerriesUC-Davis Responds To California Auditor’s Recommended Improvements To Strawberry Program
July 30, 2015
Following a six-month review of the University of California (UC)-Davis Strawberry breeding program, the California state auditor’s office has released Read More
Farm ManagementHow To Find Your Perfect U-Pick Pricing Structure
July 30, 2015
If there’s one mission impossible for pick-your-own operations, it might just be how to set a pricing structure. Odds are you’ve Read More
The Latest
Crop ProtectionResources For Knowing Your Soil
July 30, 2015
Getting to know your soil and learning other environmental and natural resources data can be downloaded and is available for use with many computer software platforms for general resource analysis and farm management. Read More
money
CitrusBankrupt Florida Farm To Yield Plenty Of Land, Equipmen…
July 30, 2015
As many as seven different buyers could be part of this Chapter 11 proceeding. Read More
Sanjay Shukla
ProductionGeometrically Speaking, Thinking Smaller Might Produce …
July 30, 2015
University of Florida scientist develops compact planting bed formula that cuts water, fertilizer, and pesticide use in half. Read More
GrapesDrought’s Impact On California Winegrapes
July 30, 2015
The impact is minimal this year, but the future is uncertain if the drought continues. Read More
Apples & PearsEPA Approves New 1-MCP Technology
July 30, 2015
EPA approved Fysium, a new 1-MCP product from Pace International LLC. Considered new technology, this product is produced on-site by Read More
Crop ProtectionNew Fungicide Targets Key Diseases
July 30, 2015
This disease control tool hits two different parts of the fungal life cycle. Read More
CitrusWestern Growers Praises Introduction Of California Emer…
July 30, 2015
Legislation contains short- and long-term provisions to deal with the historic drought. Read More
Farm ManagementFour Great Pricing Tips From U-Pick Experts
July 30, 2015
Although each of the growers I talked to has his or her own take on a pricing structure, they all Read More
BerriesUC-Davis Responds To California Auditor’s Recomme…
July 30, 2015
Following a six-month review of the University of California (UC)-Davis Strawberry breeding program, the California state auditor’s office has released Read More
Farm ManagementHow To Find Your Perfect U-Pick Pricing Structure
July 30, 2015
If there’s one mission impossible for pick-your-own operations, it might just be how to set a pricing structure. Odds are you’ve Read More
CitrusGroup Food Safety Audits May Help Prepare You For The P…
July 29, 2015
Group food safety audits, slated to be available next spring, may save small- to mid-size growers time and money. Read More
PotatoesPotato Production And The Environmental Component Of Pl…
July 29, 2015
Part of being prepared for unusual weather patterns means being on the lookout for problematic pathogens and other pests. Read More
Farm ManagementUnited Farm Workers Turns Up Heat On California Growers
July 29, 2015
With temperatures soaring into the triple digits, union organizers are focusing on heat illness regulations. Read More
Apples & PearsResearch Is Vital To Keep Asian Apple Export Markets Op…
July 29, 2015
With the large domestic production of U.S. apples in recent years, Asian export markets (China, etc.) are vital. This is Read More
Disease ControlNew Disease Control Tools For Fruit And Nut Growers
July 29, 2015
Apple scab is a big problem for growers in the Midwest and East. But, a new fungicide boasts efficacy against Read More
IrrigationRiver Point Farms Sets Standard For Water Application, …
July 28, 2015
Efficient systems help the Oregon farm, one of the largest onion growers in the U.S., achieve high yields while minimizing water inputs. Read More
Produce aisle leafy greens super market grocery store
Food SafetyLGMA Members Get High Marks In Food Safety  
July 28, 2015
The California Leafy Green Marketing Agreement’s (LGMA) annual report shows the group received the lowest number of citations in its history. Read More
FruitsFruit Grower Tour Held Next Week In New York
July 28, 2015
Registration begins at 9:30 a.m. on Aug. 5 for the 17th annual Wayne County Fruit Grower Tour presented by agr.assistance. Read More