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Effect of NPK rates and humic acid applications on growth of Egyptian cotton [electronic resource].

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Seadh, S. E

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Language: English Summary language: Arabic Description: p.2287--2299Other title:

تأثير معدلات التسميد النيتروجينى والفوسفاتى والبوتاسى والمعامله بحمض الهيوميك على نمو القطن المصرى [Added title page title]

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Mansoura University journal of plant production, 2012 v.3 (8) [electronic resource].

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In: Mansoura University journal of plant production 2012.v.3(8)Summary: Two field experiments were carried out at Gemmeiza Agric. Res. Station, El - Gharbia. Governorate during 2010 and 2011 seasons, to study the effect of four NPK fertilizers rates (100 %, 75 %, 50 % and 25 % of recommended rate) and application methods of humic acid on growth of the Egyptian cotton cuttivar "Giza 86". The recommended rate of NPK was 45 kg N +22.50 kg P₂O₅ + 24.0 kg K₂O/ fed.. The solutions of humic acid were applied with the concentration of 5 cm³/litre as a soaking seed for 18 h, 50 cm³/litre as soil application twice, 5 cm³/L as a foliar application at 40, 55 and 70 days from sowing and without humic acid as a control treatment. Leaf area index (LAI), total dry weight/plant, crop growth rate (CGR), plant height and number of fruiting branches/plant were significantly increased by increasing NPK rate from 25 up to 100% of the recommended rate at all sampling dates in both seasons. Alsso, application of 100% NPK recorded the highest net assimilation rate (NAR) at the first period (79-100 days) in the two seasons.

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Two field experiments were carried out at Gemmeiza Agric. Res. Station, El - Gharbia. Governorate during 2010 and 2011 seasons, to study the effect of four NPK fertilizers rates (100 %, 75 %, 50 % and 25 % of recommended rate) and application methods of humic acid on growth of the Egyptian cotton cuttivar "Giza 86". The recommended rate of NPK was 45 kg N +22.50 kg P₂O₅ + 24.0 kg K₂O/ fed.. The solutions of humic acid were applied with the concentration of 5 cm³/litre as a soaking seed for 18 h, 50 cm³/litre as soil application twice, 5 cm³/L as a foliar application at 40, 55 and 70 days from sowing and without humic acid as a control treatment. Leaf area index (LAI), total dry weight/plant, crop growth rate (CGR), plant height and number of fruiting branches/plant were significantly increased by increasing NPK rate from 25 up to 100% of the recommended rate at all sampling dates in both seasons. Alsso, application of 100% NPK recorded the highest net assimilation rate (NAR) at the first period (79-100 days) in the two seasons.

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