جستجوی مقالات مرتبط با کلیدواژه « کمپوست شهری » در نشریات گروه « زراعت »

The study was conducted during 2002- 2007 in the first and last stage of a four-year rotation (sugar beet, forage maize, onion, wheat and sugar beet) at Research Station of Irrigation and Drainage Rudasht. In each year, four treatments of organic fertilizers (25 and 50 t/ha urban compost and 15 and 30 t/ha sewage sludge) with a control (no organic fertilizer) were studied in a randomized complete block design with three replications. It was revealed that the maximum organic carbon content, available potassium and lead in the soil was observed in the 50 t/ha urban compost, treatment whereas the maximum available phosphorous and copper in the soil was associated with the application of 30 t/ha sewage sludge. As time elapsed, the available zinc in the soil was enhanced significantly by application of urban compost. Utilization of urban compost as well as sewage sludge significantly enhanced the sugar beet root yield. However, the sugar content was decreased. The decrease in sugar content was greater for the sewage sludge treatment than for the urban compost treatment. In the last year of the rotation, the effect of application of the organic fertilizer on sugar yield was not significant. However, due to the increase in the root impurities resulted from the application of urban compost as well as sewage sludge, the white sugar yield in the last year showed a significant decrease in comparison with that of the first year of the rotation. It follows that continuous application of the types of organic fertilizers, particularly the sewage sludge, to the Rudasht district of Esfahan as well as regions with a fine textured soil is not recommended.

Dracaena marginata Ait. (Madagascar dragon tree) and Beaucarnea recurvata Lem. (Elephant foot or Linda) are important foliage pot plants in Iran and worldwide. Suitable media is the most important parameter for growing of pot plants. The present experiment was carried out with 11 treatments in four replicates for application of agricultural or industrial wastes and evaluation of their effects on growth of foliage pot plants dracaena and elephant foot. Results showed that media containing 50% tree bark and 50% tea waste, 50 or 80% tea waste and 50 or 20% perlite, respectively and 67% leaf mould and 33% tea waste (grower's medium) had the highest effect on number of produced leaves and plant height, or tuber diameter in dracaena and elephant foot. Media containing 80% tree bark and 20% municipal compost and 80% tea waste and 20% rice hull had suitable effect on number of produced leaves produced leaves and tuber diameter of elephant foot. Based on the results of this investigation, municipal compost, with low volume, can be used for growing of pot plants that are tolerant to nearly high electrical conductivity (5 mS/cm). Dracaena and elephant foot plants in desirable media, provided from agricultural or industrial wastes in this experiment, showed higher growth than in commercial media containing 50 or 80% peat and 50 or 20% perlite, respectively.