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University of Arizona (1975)

Effect of several cultural practices on the establishment of alfalfa (Medicago sativa L.)

Meddeb, Abdelaziz

Titre : Effect of several cultural practices on the establishment of alfalfa (Medicago sativa L.)

Auteur : Meddeb, Abdelaziz

Université de soutenance : University of Arizona

Grade : Master of Science (MS) 1975

Résumé
Alfalfa (Medicago sativa var. Hayden) was planted in a greenhouse and field experiment to determine the effect of surface applied phosphoric acid, seeding method, seeding rate, and delayed overseeding with oats (Avena sativa L.) on seedling emergence and yield. The research was conducted to identify improved methods of alfalfa stand establishment. Under greenhouse conditions significantly more seedlings, emerged when seed were planted at 1.25 as compared to 2.50 cm depth. When 1,300 1/ha of 12% phosphoric acid were applied to the soil surface after planting, crusting was reduced and significantly more seedlings emerged from soil in the treated pots. In the field experiment weight of seedlings from plots treated with phosphoric acid was greater than from plots receiving soil incorporated phosphorus. Rains that occurred after planting the field experiment prevented the formation of serious soil crusts. Surface applied phosphoric acid did not increase the number of emerged seedlings under these conditions. Seedling counts were made 10 days after planting. When seed were broadcast and the soil was culti- packed and treated with acid, significantly more seedlings were produced. For broadcast plantings, seedlings were significantly larger when taken from the cultipacked furrow than from the ridge. Forage yields from the first harvest did not differ significantly for the 11.2 and 22.4 kg/ha broadcast seeding rates, but were significantly less for the lower seeding rate when seed were drilled. Delayed overseeding with oats did not significantly increase forage yield.

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