Studies on the Reasonable Application of Fertilizers for the Cultivation of Ipomoea Aquatica
Lin, C. W.
The purpose of this study was to evaluate the
effects of different fertilizer treatments on the soil properties and the
quality of Ipomoea aquatica at a simple plastic greenhouse in 2012. There were
three treatments of fertilizer applications, which were farmers conventional
method (overdose amount of fertilizer application), recommended application and
reasonable application of fertilizer. The results could be a reference of
fertilizer application and soil management for greenhouse vegetable production.
The cultivation of Ipomoea aquatic was conducted 8-planting continuous
cultivation in a simple greenhouse located at Xiluo Township, Yunlin County in
2012. Data collection included yield and quality of vegetable, changes of soil
properties before and after planting, cost of fertilizer and evaluation of
N-fertilizer efficiency. The result showed high accumulation of salts in the
area of famers conventional method and the soil EC value is much higher in
higher-temperature period (summer) than in lower-temperature period. The
comparison of the results are as the following the application amount of higher
N-fertilizers by farmers’ conventional method was higher than growth demand of
Ipomoea aquatic and the nitrate (NO3-) content in vivo of Ipomoea aquatic was
higher than other treatments. In lower-temperature growth season, average plant
height and yield of Ipomoea
aquatic were better in farmers’conventional method than in recommended and reasonable fertilizer application. It revealed that promotion of plant growth and increase of plant yield could be related to increase of N-fertilizer application in slower growth rate (lower-temperature) of period. The dosage of fertilizers in farmers’ conventional method was 43.08% higher than in reasonable fertilizer application. The vegetable yield of farmers’ conventional method was 4.92% higher in winter, but 6.49% lower in summer compared to reasonable fertilizer application. The partial factor productivity of applied nutrient in reasonable application method was higher than farmers conventional and recommended application methods. This study suggested that the appropriate fertilizer management was based on the soil fertility, climate condition and growth demand of vegetables and the result of the study could improve the utilization efficiency in keeping the yield and quality of vegetables, maintaining sustainable use of soil and preventing soil degradation.
What is already known on this subject?
The climate condition will affect the utilization efficiency of fertilizer. There are different fertility of soil in all fields. Fixed recommended application of fertilizer (N-P2O5-K2O (kg/ha) = 151-120-114) could not suit with all fields.
What are the new findings?
To evaluate the mode of annual production of Ipomoea aquatica at a simple plastic greenhouse. The appropriate fertilizer management was based on the soil fertility, climate condition and growth demand of vegetables and it could improve the utilization efficiency in keeping the yield and quality of vegetables.
What is the expected impact on this field?
Increase of plant yield could be related to increase of N-fertilizer application in winter. The yield of reasonable fertilizer application increase 6.49% in summer. It will help to reduce production and fertilizer costs, improve the yield and quality of vegetable and thus, farmer’s profit is increased.
Key words: Ipomoea aquatica, Efficiency of
fertilizer, Nitrogen Fertilizer
Accepted for publication: November 26, 2015