Like any other gramineous crop , hybrid rice keeps 80 % of totally removed k in its shoots after ripening , only about 20 % of k uptake is transported to grain , grain k content was more stable , usually around 0 . 5 % 同其它禾本科作物一樣,成熟后雜交水稻保存總移出鉀的80 %在其莖桿中,只有20 %吸收的鉀轉(zhuǎn)移到籽粒中,籽粒含鉀量更為穩(wěn)定,一般約為0 . 5 % (表6 ) 。