Fertilization in Vegetables Crops IDEA-NEW. Soils Eastern Region, soil types include: 1. Sandy clay loam soils 2. Coarse-sandy soils Sandy soils, Advantages.

Fertilization in Vegetables Crops

IDEA-NEW

Soils Eastern Region, soil types include:

1. Sandy clay loam soils

2. Coarse-sandy soils Sandy soils, Advantages

1. Easy tillage,

2. Earliest vegetable crop

3. Allow timely production operation Disadvantage, Nutrients can be leached

N, P, K, Nutrient Sources

Nitrogen,

Ammonium nitrate (34%)

Ammonium sulfate (21%)

Urea (46%)

Nitrate, preferred for plant uptake, recommended under cold conditions

Ammoniacal

N, P, K, Nutrient Sources

Phosphorus

Normal super-phosphate (20%)

Triple super-phosphate (46%)

Diammonium phosphate (46%)

Mono-potassium phosphate (53%)

N,P,K, Nutrient Sources

Potassium,

Potassium Chloride (60%)

Potassium sulfate (50%)

Potassium nitrate (44%) K has a tremendous impact in the quality of

the vegetables

Calculation of Nutrient Contents in a Fertilizer Bag 15:15:15:1B

15% N, 15% P2O5, 15% K2O, 1% B 50 kg bag contain:

15/100 = 0.15 x 50 kg = 7.5 kg N 15/100 = 0.15 x 50 kg = 7.5 kg P2O5

15/100 = 0.15 x 50 kg = 7.5 kg K2O 1/100 = 0.01 x 50 kg = 0.5 kg B

Total nutrient content: 23 kg The rest is filler

CNR: Crop Nutrient Requirement For a particular element, is defined as the

amount of nutrient in kg/ha of that element needed by the crop to produce economic optimum yield

A very important concept in vegetables, economic optimum yield is related with marketable yields

Fertilizer placement

P movement in the soil is minimal, Placed in the root zone

Banded vs. broadcasting Banded

Broadcast modified, fertilizer is applied only in the bed area

Fertilizer application:

Pre-planting: during bed formation. All P should be incorporate in the bed and 20% of

the total Nitrogen Top dressing

The remaining N is applied in two applications during the early part of the growing season, applied near the plant

Foliar application, unless symptoms show-up

Fertilizer rate for most vegetables Fertilizer rate: 50 kg DAP and 50 kg Urea Pre-planting

50 kg DAP (18 – 46 – 0) Means 9 kg N/jerib + 23 kg P2O5/jerib 9/46 = 28% of total Nitrogen crop needs

Top dressing = total rate 50 Kg Urea/jerib (46% N) 4 weeks after transplanting

25 kg Urea = 11.5 kg N/Jerib 7 weeks after transplanting

25 kg Urea = 11.5 kg N/Jerib Total Nutrients applied

32 kg Nitrogen/jerib 23 kg P2O5/jerib

Pre-planting Fertilization

Starter Fertilizer application

100 ppm N solution, cool soils