在庄内所在的山形县——北方水稻高产地区，这类迹象仍然难以辨识。
In rural regions like Yamagata, the northern rice basket prefecture where Shonai is located, the signs remain mixed.
氮素和水分是维持水稻高产和获得较高经济效益的主要因素。
Nitrogen and water are major factors for maintaining crop yield, getting better economic return.
对以水稻高产、优质为目的的镁营养和施肥研究提出了意见。
The purpose was put forward for studying on magnesium nutrition and fertilizer to acquire high yield and good quality of rice.
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