Effect Of Nitrogen And Potassium Fertilizers On Accumulation Of Potassium In Different Organs Of Rapeseed

The content of potassium (K) of different organ at different stage in rapeseed was measured under different nitrogen and potassium fertilizers treatments. The K accumulation of leaves, stem and branches, pod walls and seeds and K distribution in different organs were studied. The main results were as followed:1. The K content of leaves, stem and branches and whole plant of rapeseed descended gradually with development process. The K content of pod walls descended within 20d to 21d after flowering, then increased gradually, and descended a little before maturing of pod (about 50d after flowering). The content of K in seeds descended with the development of seed.2. The amount of K in rapeseed increased gradually with the development process. Half of potassium in plant accumulated before bolting stage, and the potassium accumulated faster from bolting to beginning of flowering. The potassium in stem and branches increased before the end of flower, and then decreased gradually. The potassium in leaves decreased gradually after bolting, then decreased quickly after beginning of flowering. There was a little K in leaves at the end of flowering.3. The potassium accumulated curve of pod walls and seeds like an"S"type, with the Richard equation analysis, the results showed that, the duration of K accumulating had little difference between the pod walls and the seeds, the duration varied from 40d ~ 42d and 42d ~ 43d respectively. The duration in prophase were 22d to 23d and 23d to24d respectively, but the amount of K accumulation had bigger difference in this phase, the K accumulation in pod walls and seeds accounted for the whole K of the plant was 45% to 50% and 34% to 37% respectively. The duration of middle stage varied from 11d to 12d and 10d to 11d, the K accumulation accounted for the whole K was 42% to 45% and 50% to 52% respectively. The duration of anaphase varied from 6d to 7d and 9d to 10d, and the K accumulation accounted for the whole K was 8% to 9% and 12% to 14% respectively.4. Potassium was mainly distributed in stem, the amount of potassium in stem and branches accounted for 60% to 70% of the whole plant; and there was about 20% to 25% of potassium in pod walls, there was about 10 percent of K distributed in seeds.5. The K content increased with the increasing of K fertilizer and increased first then descended with the increasing of N fertilizer in each stage. The amount of K increased observably with the increasing of N fertilizer application, but increased indistinctively with the increasing of K fertilizer in each organ. The K content of seeds had a little effect with the N and K fertilizer application.