Double Layer's Source-Sink for rice high yielding cultivation

We studied the relationship of Double Layer's Source-Sink of photosynthetic production and the mineral nutrients in rice high yielding cultivation. The experiment was conducted with Yayou 2 in two types of soil-water environments, i.e. narrow bed with dense ditch (NBDD) (the bed was 0.67 m wide), the ditch 0.26 m wide and 0.26 m deep), and common paddy field (CPF) having the same irrigation management. Three N application levels were