禁漫天堂

Most of the soils in Georgia lack vital plant nutrients or have low pH levels. Since these soils exhibit significant variability in their response to fertilizer and lime additions, a soil test is recommended before planting. A soil test is a chemical technique used to determine the status of available nutrients in a soil sample. It is a common method used to predict how soils will react to the addition of lime or fertilizer and calculate how much of each is required for crop production.

It is essential to keep in mind that a soil test only assesses a portion of the soil’s overall nutrient supply. The raw data values from the analysis of a soil sample are not very useful on their own. The test must be calibrated against field nutrient-rate experiments before the values can be used to estimate the nutrient requirements of crops.

Based on past experiments, 禁漫天堂 fertilizer recommendations for specific vegetable crops are available in the crop sheets section of the 禁漫天堂 Soil Test Handbook (). Adjustments to pH and most other nutrients should be applied before planting using your soil test results and the 禁漫天堂 soil test handbook recommendations. However, since nitrogen (N) and potassium (K) are required at high rates and are prone to leaching, especially in sandy soils, these nutrients are commonly applied weekly or even daily through drip irrigation in a process called fertigation.

The following tables are the daily/weekly recommended N and K application schedules for bell peppers, watermelons, tomatoes, and cabbage. The most common, widely used liquid fertilizers are 7-0-7 and 4-0-8 (on a fertilizer label, these three numbers represent the percentages of nitrogen-phosphorus-potassium). Either is adequate and offers growers different options based on price and the potassium levels in leaves.

These schedules are based on overall crop demands and nutrient demands at various growth and development stages. In general, crop growth and nutrient demand are low at transplanting, increase during vegetative growth, peak during reproductive growth, and level off in a maintenance dose.

In the spring, most bell peppers, watermelons, and tomatoes typically require 10 weeks (70 days) until the first harvest. The amount of fertilizer recommended should be applied before harvest, and additional maintenance fertilizer can be applied beyond the recommended amount to support extended harvests. Fertilizers should be injected at the end of an irrigation cycle so the soluble nutrients are not leached. To prevent salt buildup and emitter blockage, flush the lines for 5 to 10 min after fertilizer injection.

Bell Peppers

• The highest recommended doses of nitrogen (N), phosphorus (P), and potassium (K) are 225, 120, and 175 lb/acre, respectively.
• This program assumes 1/4 to 1/3 of N, 1/2 to 1/3 of K, and 100% of P are applied up front as preplant granular fertilizer.
• High amounts of ammonium nitrate compete for calcium in the plant, which can increase blossom end rot (BER), so we recommend applying a calcium-nitrate fertilizer such as CN-9 (5 gallons/acre) in rotation with either 4-0-8 or 7-0-7. The maximum applied dose should not be more than 20 lb N/week.
• There may be one to three weekly applications of calcium nitrate needed at the beginning of first bloom or at the first sign of BER.

Watermelons

• The recommended doses of N, P, and K are 140–170 lb/acre for each of these three fertilizers.
• This program assumes 1/4 to 1/3 of N, 1/2 to 1/3 of K, and 100% of P are applied up front as preplant granular fertilizer.
• High amounts of ammonium nitrate compete for calcium in the plant, which can increase BER, so applying a calcium-nitrate fertilizer such as CN-9 (5 gallons/acre) in rotation with either 4-0-8 or 7-0-7 is recommended. The maximum applied dose should not be more than 15 lb N/week.
• There may be one to three weekly applications of calcium nitrate needed at the beginning of first bloom or at the first sign of BER.

Tomatoes

• The maximum recommended doses of N, P, and K are 225, 200, and 225 lb/acre, respectively.
• This program assumes 1/4 to 1/3 of N, 1/2 to 1/3 of K, and 100% of P are applied up front as preplant granular fertilizer.
• High amounts of ammonium nitrate compete for calcium in the plant, which can increase BER, so applying a calcium-nitrate fertilizer such as CN-9 (5 gallons/acre) in rotation with either 4-0-8 or 7-0-7 is recommended. The maximum applied dose should not be more than 20 lb N/week.
• There may be one to three weekly applications of calcium nitrate needed at the beginning of first bloom or at the first sign of BER.

Cabbage

Cabbage is most commonly grown on bare ground in Georgia. When grown on plastic mulch, it is typically grown as a second or third crop after the primary cash crop has been harvested. This allows for the recovery of expenses, but more liquid phosphorus must also be applied in the drip since all of the granular preplant phosphorus for the initial crop is exhausted.

• Nitrogen applications should be divided into no fewer than three applications per week.
• The maximum recommended doses of N, P, and K are 225, 110, and 210 lb/acre, respectively.
• This recommendation assumes that the second-crop plastic has no residual N fertilizer present at planting.
• We recommend applying a calcium-nitrate fertilizer such as CN-9 (5 gallons/acre) in rotation with either 4-0-8 or 7-0-7. Calcium applications should begin within 2 weeks of planting and continue as needed.

Status and Revision History
In Review on Apr 29, 2025
Published on May 01, 2025