ผลของการปรับปรุงดินด้วยวัชพืชน้ำและมูลสัตว์ต่อการเจริญเติบโตของผักบุ้งจีนและสมบัติดิน

Suttayot Yimpoolsap

Authors

Suttayot Yimpoolsap Program in Environmental Technology, Faculty of Science and Technology, Phranakhon Si Ayutthaya Rajabhat University.

Keywords:

Chinese water spinach; Soil properties; Aquatic weeds; Animal manures

Abstract

This study aimed to investigate the effects of aquatic weeds, namely duckweed and water lettuce, in combination with animal manures, including goat and horse manure, on the growth of Chinese water spinach (Ipomoea aquatica Forsk. var. reptans) and soil properties after cultivation. Soil was collected from Ban Thung Haeo community, Sawaeng Ha District, Ang Thong Province, which was originally acidic (pH 5.14) and non-saline (EC 0.17 dS/m), and incubated with the organic materials for 14 days. The incubation markedly increased soil EC (4.86–9.11 dS/m), reaching levels classified as moderately to strongly saline. Analysis of variance (ANOVA) showed that soil improvement with goat manure combined with duckweed resulted in the highest average growth of Chinese water spinach (p<0.05). Analysis of covariance (ANCOVA), using pre-planting EC as a covariate, further clarified the effects of organic amendments independently from the influence of salinity. Moreover, principal component analysis (PCA) revealed that soil amended with goat manure and duckweed was associated with the highest plant growth and biomass, whereas the water lettuce treatment was associated with the highest nitrate (NO₃^-) content but the lowest plant growth compared with other treatments. This study demonstrates that aquatic weeds and animal manures from the Ban Thung Haeo community can be utilized to improve soil for increasing Chinese water spinach production; however, the potential side effect of increased soil salinity after incubation with such materials should be carefully considered.

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