Influence of Rice Straw and Bio-organic Fertilizers on Cotton Fiber Quality under Saline Soils

摘要

Field experiment was conducted at South El- Hossinia Res. Station, El-Sharkia Govemorate, Agric. Res. Center (ARC), Egypt, during 2011-2012 seasons. To study the effect of adding rice straw as an organic waste to saline soil with the inoculation of some bacterial strains as biofertilizer (PGPR) and tea compost both separately or together with or without rice straw on cotton fiber quality compared to the control. As well as, study the impact of these transactions on some soil chemical and biological properties. The experiment was laid out in a split plot design with four replicates. The rice straw (R) application was taken the main plot as a main factor with two methods (with rice straw, without rice straw), whereas; the others fertilizers Treatments(T) were distributed randomly in the sub plots. Results revealed that, treating saline soil by rice straw achieved the highest content of soil organic matter, fiber upper half mean, fiber uniformity index, fiber strength, fiber elongation percentage, micronaire value, fiber maturity ratio and fiber reflected percent. In contrast, the fiber yellowness degree (b+ )decreased, compared with the soil untreated with rice straw. All transactions applied with tea compost in addition to PGPR led to significantdecrease on pH and EC levels of the soil compared with other treatments during the period of the two seasons. Transactions with added bacterial strains led to increase the nitrogen, phosphorus and potassium elements to be soft soil compared with the restof the transactions, as well as, the control treatment. Bacterial strains transactions led to increase soil biological activity compared with the rest of the transactions, as well as the control treatment. Spraying the mix of bacterial (PGPR) and tea compost in the presence of rice straw resulted in significant increase cotton fiber upper half mean, fiber reflected percent, fiber strength, Micronaire value and fiber maturity ratio. On the contrary, they had no significant effect on, fiber elongation percentage, uniformity index and yellowness degree, in comparison with the rest of the transactions, as well as the control treatment.