Effect of phosphorus and zinc application on the growth and yield of geranium (Pelargonium graveolens) intercropped with garlic (Allium sativum)

Field experiments were carried out to evaluate the effects of different doses of fertilizer P and Zn on growth and yield of geranium and garlic in a intercropping system. Application of phosphorus at 40 kg P₂O₅ ha⁻¹ proved significantly better than control (no P) in the production of geranium oil and garlic bulbs. Uptake of Zn also increased significantly up to 40 kg P₂O₅ ha⁻¹. Higher rates of P decreased the Zn uptake by the plants. Application of 30 kg Zn SO₄ ha⁻¹ showed a significant response on the herb and oil yields over the no zinc application. Application of 40 kg P₂O₅ and 30 kg Zn SO₄ ha⁻¹ is, therefore, recommended for achieving the maximum yield advantages in a geranium-garlic intercropping system.