Abstract
We examined the effect of drainage and irrigation by the Farm-Oriented Enhancing Aquatic System (FOEAS) on yield of summer-sown winter-harvest broccoli over three cultivations. Irrigation treatments were non-irrigation, once at transplanting, and twice at transplanting and the middle stage. Regarding the effect of drainage, constructing FOEAS reduced the drop in the oxygen concentration of soil during rainfall. As for cv. Grand-dome, the percentage of hollow stems was lower in the plot with FOEAS than that in the plot without FOEAS in the dry year. On the other hand, cv. Bellstar plants had a larger weight and width of the head in the plot without FOEAS than those in the plot with FOEAS in the dry year. Concerning the effects of irrigation, cv. Grand-dome in the twice-irrigated plot showed a lower percentage of hollow-stems than that in the plot without irrigation in the dry year. Comparing cv. Bellstar heads in the twice-irrigated plots with those in the plot without irrigation, the width was 7% larger in the dry year, and the weight was 10% larger in the early-rainy and middle-dry year. These results suggest that irrigation and drainage controlled by FOEAS promote stable production of broccoli.
