INFLUENCE OF PLANTING SCHEMES ON THE YIELD OF ROMAINE LETTUCE (LACTUCA SATIVA VAR. LONGIFOLIA) CULTIVARS UNDER SPRING SOWING CONDITIONS IN UZBEKISTAN

Jahongir M. Mengniyozov, Ravza F. Mavlyanova

Authors

Jahongir M. Mengniyozov, Ravza F. Mavlyanova Research Institute of Vegetable, Melon Crops and Potato, Uzbekistan

Keywords:

plant density, planting scheme, plant weight, romaine lettuce, leafy lettuce, varieties, vegetation period, yield.

Abstract

The article presents the results of a study on lettuce cultivars conducted at the Research Institute of Vegetable, Melon Crops and Potato in Uzbekistan. The research examined romaine lettuce (Lactuca sativa var. longifolia ) cultivars in comparison with a leafy lettuce (Lactuca sativa L.) during the spring sowing season under five planting schemes: 70×10 cm, 70×20 cm, 70×30 cm (control), 70×40 cm, and 70×50 cm. The experiment was arranged in a Randomized Complete Block Design (RCBD) with four replications. It was established that for the leafy lettuce cultivar Kok shokh, the planting scheme of 70×20 cm produced a yield of 1.76 kg/m² at 10% technical maturity, with plants characterized by tender leaves suitable for consumption. The optimal planting scheme for this cultivar was 70×30 cm, providing the highest yield of 1.95 kg/m². For the romaine lettuce cultivars Korolevskiy Pir and Quintus, the 70×20 cm scheme resulted in yields of 2.45–2.53 kg/m² with tender leaves from not yet fully developed plants. The optimal spacing for these cultivars was also 70×30 cm, at which the plant mass reached 624–641 g and the yield was 2.93 and 3.02 kg/m², respectively. Increasing the distance between plants in a row to 50 cm increased plant mass (675–697 g) but reduced overall yield by 22–35% due to lower plant density.

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