Nutrient Uptake And Transfer After Anthesis In Barley

The experiment was conducted on the farm of Yangzhou University, Jiangsu from 2006 to 2008. With Yangnongpi 5, Yangsimai 3, Yangnongpi 2, Gangpi 4 as the materials, the effects of different N rates and sowing dates on the absorption and transfer of N, P, K after anthesis of barley had been studied. The main results are as follows.With the increase of N application, the panicle number of each variety per 667m2 was increased; but the effect on grain number per spike was not significant. Dry matter accumulation of leaves, stems, awns and cobs was increased during the flowering stage and mature period with the increase of N application. N fertilization treatments had significant influence on grain weight and dry matter weight. The N content of each part of the plant variety showed a growing trend during the flowring stage and mature period with the increasing N application. Appropriate increase of N application could improve the grain protein content. With the increase of N application, N accumulation during pre- anthesis stage, N content during the mature period, N accumulation after anthesis, N transfer amount showed an increasing trend, while the N transfer efficiency, the contribution rate of N transfer and N harvest index showed a decreasing trend. P content of each variety during the flowering stage and the mature period showed a growing trend. The differences among each N treatment were significant. Appropriate increase of N application could promote the absorption of P. With the increase of N application, P accumulation during the pre-bloom stage, P content during mature period, P accumulation after anthesis, P transfer amount, P transfer efficiency, the contribution rate of P transfer and P harvest index all showed an increasing trend. K content of each part of every plant variety showed an increasing trend during the flowering stage and mature period. The differences among each N treatment were significant. With the increase of N application, K accumulation during pre- anthesis stage, K content during mature period, K transfer amount, K transfer efficiency and K harvest index all showed an increasing trend. Appropriate increase of N application could promote the absorption of K. K accumulation during the post-bloom stage showed negative. K loss amount would increase with increasing amount of N application.With the postpone the sowing date, the panicle number of each variety per 667m2 didn't change so much, and the effect on grain number per spike was not significant. Appropriate late-sowing satisfied the requirement of appropriate temperature during the heading and seeding stage, increased the grain plumpness and promoted the increase of 1000-grain weight, which finally affected the barley yield. With the delay of sowing time, dry matter accumulation of leaves and stems decreased and N content of each part of every plant variety showed a growing trend during the flowering stage and mature period. The differences of each sowing date were significant. Appropriate late-sowing of barley could promote absorption and transfer of N. The results of the third sowing-date experiment showed best in P accumulation during pre-bloom stage, P content during mature period, P accumulation after anthesis, P transfer amount, P transfer efficiency, the contribution rate of P transfer and P harvest index. Appropriate delay of sowing date of barley promoted the absorption and transfer of P. With the postpone of the sowing date, K accumulation and K transfer amount both showed an increasing trend, while K transfer efficiency and K harvest index showed a decreasing trend during the mature period.