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Abstracts
Soil management technology for Yam bean seed production (Pachyrhizus erosus) to

increasing quality and quantity of Yam bean seed in sandy soil at Mahasarakham Province. The
experiment had carried out on October 2017-September 2020 (3 years). There were two crop

cultivation and conducted with farmer fields at Ban Hin Lad Pattana, Tha Song Khon Sub-
district, Mueang District, Maha Sarakham Province. The objectives of this studied were
investigated sustainability of soil, fertilizer and organic matter management for the production

of yam bean seed with good quantity and quality. There were studied on changing of soil
chemical properties prior and after soil management also, studied the economic returning of
yam bean seed production. There was experiment Factorial 2x4 in RCBD with 3 replications.
Main factors were 1) raised the furrow 2) no-raised the furrow. Sub-factors were 1) Farmer

practices 2) The application chemical fertilizer based on soil analysis values 3) The application
chemical fertilizer as recommended rate and 4) The application chemical fertilizer as
recommended half rate. There were applied compost mixed in soil in all of factors experiment
and sprayed bio-fermented water and insect repellent extracts.

The results of the study found that after harvested yam bean seed for method of raised-furrow
in combination with application chemical fertilizer as recommended rate showed highest yield
seed weight of yam bean was 184.62 kg/rai, followed by the raised-furrow method with
fertilizer based on soil analysis the average yield of seed weight was 155.58 kg/rai, and the

cultivation method was raised-furrow with a half-rate of chemical fertilizers. Yielded, the lowest
average seed weight was 81.10 kg/rai. It was seem raised plots were grown in conjunction with
various fertilizer management methods yield of yam bean seed weight was higher than

cultivation method without raised-furrow. However, yields of yam bean seeds differed
according to the recipes of fertilizer. The quality of yam seeds had no differences in each
recipe but different by year to year. The experiment found that fertility in soil included with
available-phosphorus, exchange-potassium, calcium, magnesium and cation exchange capacity
were increased. Soil reaction value had increased. When calculated the economic returning, it

appears that method of raised-furrow with fertilizer as recommended rates has net income was
14,584 baht/rai, followed by method of non-furrow with fertilizer as recommended rate has the
net income was 13,152 baht/rai

Keyword : Yam bean, Seed of Yam bean, Soil Management, Liquid Organic Fertilizer,
Compost of cow dung, chicken dung and bio-extract, Chemical Fertilizer, Sandy Soil