Page 10 - ผลกระทบการเปลี่ยนแปลงสภาพภูมิอากาศต่อความชื้นในดินและการเจริญเติบโตของข้าวโพดเลี้ยงสัตว์บนพื้นที่สูง จังหวัดเชียงใหม่ The Impact of Climate Change on Soil Moisture and the Growth of Maize on Upland of Chiang Mai province.

ห้องสมุดกรมพัฒนาที่ดิน

Abstract

The impact of climate change on soil moisture and the growth of maize on the upland of Chiang
Mai province at Kong Khaek Subdistrict, Mae Chaem District, Chiang Mai province in 2018 – 2020.
The objectives are to study the moisture content in the soil and the appropriate frequency of
watering for growth and yield of maize, proper soil management for maintaining soil moisture for
growth and yield of maize, and study of water management methods for maize enough
throughout the planting period with different methods of handling soil and water. The experiment
design was split-plot design consists of the main plot is the mulching and sub-plot is watering

period with 3 replications. The main plots consist of M1: no mulching and M2: mulching with rice
straw and manure. And sub-plots consist of S1: no watering, S2: watering daily, S3: watering every
2-day, S4: watering every 3-day, and S5: watering every 4-day. The result showed that the
mulching method affects soil bulk density is lower than in the no mulching method. While pH,
organic matter, phosphorus and potassium content in soil have increased than the no mulching
method. On the other side, the no watering method induces the highest phosphorus content in
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the soil in the 2 year, whereas daily watering affects potassium content in the soil in the 1st
year. Considering the effect of mulching on plant growth and yield of maize showed that the

mulching method and watering period was not significantly different and had no effect on the
width, length, number of rows, number of seeds per row, and seeds weight.
The results of the study on the effect of mulching and watering. It was found that there was no
interaction and no statistical difference. However, mulching with rice straw and manure were
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significantly effect on maize yields. It has appeared in the 2 and 3 years. In addition, watering
every 4-day had a significant effect on maize yield. The result shows that maize production is the
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highest average yield of 1,390 kg per rai in the 2 year. Moreover, considering the yield
productions, costs, and economic returns and statistical analysis results. It was concluded that no
mulching and watering every 4-day were the most suitable methods for the growth and yield of

maize.