Kan chai insi watsadu lua chai nai kan kaset I. Phon khong insi watsadu to kan charoen toepto lae phomphalit khong khao: kan thotlong thi I.

Supamard Panichsakpatana; Suriya Sassaranakkit; Sorasith Vacharotayan

Kan chai insi watsadu lua chai nai kan kaset I. Phon khong insi watsadu to kan charoen toepto lae phomphalit khong khao: kan thotlong thi I.

1985

Supamard Panichsakpatana | Suriya Sassaranakkit | Sorasith Vacharotayan

Seven treatments of fertilizer and organic waste materials (OWM) namely rice straw compost (RSC), activated sludge from beer factory (AS), activated sludge from whisky factory (SW), filter cake from sugar refinery factory (FC), castor meal (CM), inorganic fertilizer (F), and check (Ch) were used in the study. The results indicated that in RSC treatment, initial growth of rice as measured by dry matter of shoot and root and tiller number was very active until before flowering atage. After flowering, however, the plants showed N-deficiency symptom and slow growth were observed throughout the planting period. In CM treatment, slow growth during initial growth stage was seen from plants grown in both Rangsit and Roi Et soils. After flowering, the plant in the treatment started growing rapidly until harvesting period. Relation between rice growth and yield was also observed in the experiment. Most of released N from OWM was observed from the initial plant growth to flowering stage except that from CM which showed opposite result. If efficiency of OWM as N-source was considered, CM was regareded as the highest one when approximately 60% of its total N was available to the rice plant whereas RSC was among the lowest when only 6-8% of its total N could be utilized by the plant. In addition, nitrogen content in grain and straw of the rice grown in CM treatment was remarkedly high whereas that in RSC treatment was considerably low. It was noticeable that the rice plant grown in Rangsit soil applied with FC showed considerably high content of phosphorus in both grain and straw.

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