Bio-chemical studies for production of organic cotton : 1- effect of organic fertilization and bio-control on leaf and seed chemical composition [electronic resource].

Includes references.

Two field experiments were carried out at EI-Gemmeiza Agricultural Research Station, El-Gharbia Governorate during two successive seasons of 2012 and 2013. These experiments were conducted to study the probability of using clean agriculture to produce organic cotton and reduce environmental pollution. A randomized complete block design with 4 replicates was used in both seasons, where the following twelve patterns were evaluated with regard to leaf and seed chemical compositions of the Egyptian cotton (Gossypium barbadense, L.), cultivar Giza 86:- Patterns 1, 2, 3 and 4 included two rates of mineral NPK fertilizers ( 45 kg N : 22.5 kg P₂O₅ : 24 kg K₂O/fed. (The recommended rate) and 60 kg N : 30 kg P₂O₅ : 36. kg K₂O/fed) in combination with chemical or bio- control, respectively. Patterns 5, 6, 7, 8, 9, 10, 11 and 12 included two rates of organic NPK fertilizers (45 kg N : 22.5 kg P₂O₅ : 24 kg K₂O and 60 kg N : 30 kg P₂O₅ : 36 kg K₂O/fed) in the form of pigeon refuse as source of N in Patterns 5, 6, 7 and 8 and in the form of photocompose in Patterns 9, 10, 11 and 12 + in the form of phosphate ore (20% P₂O₅) + Phosphorein as source of P + in the form of potassium ore (8.2% K₂O) as source of K in Patterns 5, 6, 9 and 10, in combination with bio- control. In patterns 7, 8, 11 and 12 the source of P was mixed mineral ore (6.14% P₂O₅) + Phosphorein and the source of K was mixed mineral ore (3.37% K₂O) and potassium ore, in combination with bio- control. The obtained results could be summarized as follows Leaf N, P, K, Ca, Mg, Fe, Zn, Mn and Cu contents were significantly affected by the tested Patterns in both seasons, in favor of Pattern 8 (high organic N'PK rate, where the source of N was pigeon refuse, the source of P was mixed minerals ore + Phosphorein and the source of K was mixed minerals ore and potassium ore in combination with bio- control) and Pattern 6 (high organic NPK rate, where the source of N was pigeon refuse, the source of P was phosphate ore + Phosphorein and the source of K was potassium ore in combination with bio- control). Leaf chlorophyll a, b, total chlorophyll, carotenoids, reducing sugars, non reducing sugars and total solube sugars contents were significantly affected by the tested Patterns in both seasons, where the superiority was found in favor .of Pattern 8 (high organic NPK rate, where the source of N was pigeon refuse, the source of P was mixed minerals ore + Phosphorein and the source of K was mixed minerals ore .and potassium ore in combination with bio- control).

Summary in Arabic.

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