Page 5 - การจัดการดินด้วยเทคโนโลยีกรมพัฒนาที่ดินที่เหมาะสมต่อการปลูกมันสำปะหลัง ในเขตพื้นที่ไม่เหมาะสมสำหรับการปลูกข้าวโดยเกษตรกรมีส่วนร่วม The LDD Technology Management of Soil Suitable for Growing Cassava in Areas Unsuitable for Rice Cultivation by the Participation of Farmers.

ห้องสมุดกรมพัฒนาที่ดิน

5

บทคัดย่อภาษาอังกฤษ (Abstract-English)

The study of soil management by appropriate technology to cassava in non-suitable

rice zone was conducted on October 2017 to December 2020 at Na-Year sub-district , Na-Year

district , Ubonratchatani province. The location of experimental plot was categorized on soil

group no.37A (Kong soil series : Kng). The RCBD was designed in 4 replications with 5
treatments as following : 1) control plot , 2) farmer method (applying 15-15-15 fertilizer at 50

kilogram per rai) , 3) applying fertilizer as fertilizer recommendation software , 4) applying high

quality organic fertilizer at rate of 100 kilograms per rai and 5) applying half rate of fertilizer

recommendation software with high quality organic fertilizer at rate of 50 kilograms per rai. It

was found that treatment 4 and 5 could raise up soil pH from 5.05 to 5.07 and 5.10

respectively while the soil organic matter content was not increased. The height of Rayong72
nd
variety cassava in the second year was statistically significant. The 2 treatment got the tallest
st
cassava stem (178.47 centimeters). The canopy of 80 , 120 and 240 day old cassava in the 1
nd
st
and 2 year were non-statistically significant. The 1 year cassava yield in treatment 5 got the
highest weight (6938.00 kilograms per rai) which was statistically significant. The yield , the
nd
amount of root and starch percentage in the 2 year experiment were not statistically
significant.

The transferred technology plots was located on soil group no. 41 (Mahasarakham soil

series) which was sandy and non-suitable rice zone. The recommendation was application of

50 kilograms per rai of high quality organic fertilizer with half rate fertilizer of plant nutrient

requirement. The cassava required plant nutrient as N:P:K at 16:4:16 kilograms per rai which

equivalent to nitrogen fertilizer (46-0-0) at 15.5 kilograms per rai , phosphorus fertilizer (0-46-0)
at 4.5 kilogram per rai and potassium fertilizer ( 0-0-46) at 13.5 kilogram per rai. The average

yield , the amount of root and starch percentage were 4,844 kilogram per rai , 15 roots per

stem and 20.47 % , respectively. The average value of yield was 8,719.20 baht per rai ( the

market price of cassava was 1.80 baht per kilogram). The average return on cash cost was

5,103.03 baht per rai while the average above-variable cost return was 5,107.70 baht per rai

and the above-total cost return was 2,157.70 baht per rai.