Page 132 - เอกสารประกอบการประชุมวิชาการกรมพัฒนาที่ดิน ปี2560 วิชาการงานพัฒนาที่ดิน ขับเคลื่อนคุณภาพชีวิตเกษตรกรสู่ความยั่งยืน : ระหว่างวันที่ 19-21 กรกฎาคม 2560 ณ โรงแรมสยามออเรียนทัล อำเภอหาดใหญ่ จังหวัดสงขลา
P. 132
ห้องสมุดกรมพัฒนาที่ดิน
ประชุมวิชาการกรมพัฒนาที่ดิน ปี 2560 “วิชาการงานพัฒนาที่ดิน ขับเคลื่อนคุณภาพชีวิตเกษตรกรสู่ความยั่งยืน” วันที่ 19 - 21 กรกฎาคม 2560
ABSTRACT
The water management in farming production for economic crops. The objective is to
study suitable of irrigation rate for sweet corn in clay soil. The experiment plot located at
Land Development Research and Technology Transfer Division, Park Chong District,
Nakornratchasrima Province, Thailand since February - March 2015 in Wang Saphung Soil
series. The study used Hybric3 corn variety. The experimental design was split plot in RCBD 3
replication 3 mainplots and 4 subplots. The main plot factor was irrigation rate such as apply
water when the soil water content deplete to 40, 60 and 80% AWC, respectively. The
subplots were Nitrogen fertilizer rate such as apply fertilizer rate 1, 1.5, 0.75 and 0.5 times
according to the suggestion of soil analysis, respectively.
The results of this research found that the interaction between irrigation rate and
nitrogen fertilizer rate of the characteristics of plant height, above ground biomass, ear of
corn weight and ear number of corn weren't significant. The effect of irrigation rate was
significant for the characteristics of plant height, above ground biomass and ear of corn
weight, but the number ear of corn wasn't significant. The plant heights at 30 DAP was 69.7
cm. The highest of corn heights was the irrigation rate 40% AWC, 60% AWC and 80% AWC,
respectively. At the irrigation rate 40% AWC, the highest of corn quality (% Brix) was 15.2%.
The ear length without husk was 20.6 and 20.9 cm. at the irrigation rate 40%and 60% AWC,
respectively. The effect of nitrogen fertilizer rate was significant for the characteristics of
plant heights and ear of corn weight, but above ground biomass and ear number of corn
wasn't significant. The nitrogen fertilizer rate 1.25 according to the suggestion of soil analysis
had a highest ear of corn weight as 2,458 kg/rai but to consider interaction between corn
weights at nitrogen fertilizer rate 1.25 times vs each irrigation rate show that corn growth
were stopped and quality of corn were decreased when the soil water content deplete to
80% AWC and yields
So, the suitability of irrigation rate for sweet corn on Wang Saphung Soil series was
during 40 - 60% AWC, 2 day per time and 16,000 liter per rai. And, used the nitrogen fertilizer
rate 1.25 according to the suggestion of soil analysis by soil and fertilizer management
program.
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