Some organically-based fertilizers, such as PHC All-Purpose Fertilizer, also contain small amounts of synthetic fertilizers to ensure the availability of nutrients. For the long-term health of your garden, feeding your plants by building the soil with organic fertilizers and compost is best.

With the exception of nitrogen and phosphorus, most alkaline, clay type soils usually contain enough of these elements for vegetable production. In acid sandy soils, nitrogen, phosphorus, potassium, calcium, magnesium and, at times, sulfur and boron may need to be added for successful crop production.

The Organic manures are sometimes placed on the surface of soil and incorporated into the soil with a plough or rot tiller before planting. Fertilizer can also be applied in bands at the bottom of plough furrows or broadcast or spread on top of ploughed soil that is then worked into the soil with a harrow before planting of all the major fertilizer nutrients, nitrogen is the main nutrient affecting soil pH, and soils can become more acidic or more alkaline depending on the type of nitrogen fertilizer used. … Phosphoric acid is the most acidifying phosphorus fertilizer. – Potassium fertilizers have little or no effect on soil pH.

Three main macronutrients:

• Nitrogen (N): leaf growth
• Phosphorus (P): Development of roots, flowers, seeds, fruit
• Potassium (K): Strong stem growth, movement of water in plants, promotion of flowering and fruiting;
• Three secondary macronutrients: calcium (Ca), magnesium (Mg), and sulfur (S);
• micronutrients: copper (Cu), iron (Fe), manganese (Mn), molybdenum (Mo), zinc (Zn), boron (B), Silicon (Si), cobalt (Co), and vanadium (V).

Slow Release Fertilizer: How to Use Them in the Garden

When you compare controlled or slow release fertilizer to other types of commercial fertilizers, you are sure to find that they are very convenient and provide predictable results.
Still, you may wonder whether these products can provide complete nutrition for your plants. Should you combine slow and controlled release fertilizers with other supplements.