The proper agricultural management practices for the new promising hybrid cotton (Giza 77 x Pima S⁶) [electronic resource].

Includes references.

The field experiments were conducted at Sakha Agricuttural Research Station at Kafr EI-Sheikh Governorate, Egypt, dUring the gr<7Ning seasons of 2009 and 2010 to preparing the suitable agricuttural managernen!s praclices (planting dale, pIant population (hill spacing) and nitrogen ferlilizer level) tor new promising hybrid cotton (Giza 77 x Pima SS). The first experiment (detriment the suitable planting dale) was grown under three planting dales 1" April, 15'" April and 1"May. The randomized complete block design was used with four replications. The second experiment (detriment the suitable pIant population (hill spacing) and nitrogen fertilizer level) were grown under split plot design. The main plots involved the three hill spacing (20, 25, and 30 em between hills) and the sub plots included three nitrogen fertilizer levels (45, 60 and 75 kg N /fed.). The results indicated that early planting date in 1st April significantly increased seed cotton yield/fed. due to the increase of number of open bolls /plant and boll weight. Increasing hill spacing from 20 to 30 em (decreasing plant population) significantly increased number of sympodia /plant, number of open bolls /plant, boll weight and seed collon yield /fed. While plant height, first sympodial position, earliness % and lint % decreased. As for nitrogen levels, plant height, number of sympodia /plant, first sympodial position, number of open bolls /plant, boll weight, seed index and ...ed collon yield/fed. increased by increasing nitrogen levels. The interaction between plant population (hill spacing) and nitrogen fertilizer levels gave significantly effect on all character studied except lint % and fiber properties. The interaction 30 em between hills and 75 kg N /fed gave the highest number of sympodia plant, number of open bolls, boll weight, seed index and seed collon yield /fed. The studied treatments did not exhibit any Significant effect on all fiber properties. It could be concluded that the highest seed collon yield/fed. was obtained from planting the new promising hybrid colton Giza 77 x Pima ft' early in 1" Apnl under 30 em hill spacing and 75 kg N/fed. under Sakha location.

Summary in Arabic.

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