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| Effect of compost
and extracted organic substanseon Mapbon soil |
| Vanlada
Sunanthapongsak Pitayakon Limtong Siangjeaw Piriyaprin Chaveevan Leaungvutivirog Prasode Thamakate Yinglek Pongpayak and Lerdchai Pulporn |
| ABSTRACT
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| Study on the effect of compost and extracted organic substance on Mapbon soil series properties and asparagus yield was carried on Land Development Station, Amphur Pruokdeang, Rayong Province during 1991-1994. Randomized complete block design was planned which consisted of compost application as 0, 4, 6 and 8 tons per rai with and no addition of humic substance 1 Litre per rai and chemical fertilizer (15-15-15) 25 kg per rai. There were 9 treatments in 3 replications. The results indicated that compost had an important role to enhance microbial population and mineral nutrients in soil. Only chemical fertilizer application had no effect to increase soil potential for asparagus yield. Application higher rate of compost had affected to develop soil biological, chemical and physical properties. The period of compost residual effect in soil is an indicated index for amount of organic matter level which also increased available nutrients in soil. Addition of organic substance had only a little affect raising soil microorganisms when cooperated with compost. |
| Applied 4 tons per rai of compost had residual effect to increase biochamical activities in soil for 2 years after planting asparagus where as residual effect 3 years were appeared in compost 6 and 8 tons per rai. Asparagus yield in 6 tons per rai of compost was similar to 8 tons per rai. So in this research compost 6 tons per rai with chemical fertilizer is the suitable rate for soil improvement and increasing asparagus yield. Bacterial number in soil increasing at 6 and 18 months from 7.53 to 8.60-8.85 and 8.78-9.2 log no. per gm soil and fungal population changed at 6, 18 and 30 months from 4.87 to 5.44-5.56, 5.54-5.61 and 5.76-5.93 log no. per gm soil respectively. Compost had effect increasing organic matter in soil from 0.85 to 1.24 percent at the beginning of asparagus plantation. Nitrogen content in soil was changed form 0.08 to 1.11-1.13 percent at 12 to 36 months. Furthermore phosphorus, potassium, calsium, magnesium and sulphur content in soil were raised from 8-10, 44-46, 92-100, 35-38 and 26-31 to 15-18, 72-86, 174-230, 61-82 and 52-79 ppm respectively at 12 to 36 months of planting period. The soil pH level increased from 5.7 to 5.9-6.1. In consideration of asparagus growth, the number of shoot per plantlet was increase from 1.30-2.09 to 2.81-2.86 shoots per planlet. The length of shoot was between 18.9-19.9 cm and the asparagus yield was 1,058.1-1,063.5 kg per rai per year. For the average income fo the treatment was 9,372.25 baths per rai per year. |
| Keywords: compost, extracted organic substance, asparagus, Mapbon soil series |