直播冬油菜干物质积累及氮磷钾养分的吸收利用

doi:10.3864/j.issn.0578-1752.2011.23.008

Abstract

Abstract: 【Objective】An experiment was conducted to study the law of nutrients absorption and accumulation for high yield direct seeded winter oilseed rape (Brassica napus L.).【Method】In order to know N, P and K absorption and utilization of winter oilseed rape which produced 4 500 kg•hm-2 seeds under high yield cultivation patterns, dry matter accumulation and nutrient content and nutrient accumulation in different organs were tested at regular intervals.【Result】Results showed that dry matter accumulation appeared S-type curve and showed as blooming period＞seedling period＞pod period, and roots, stems, green leaves and defoliation reached maximum at 185, 200, 130 and 230 days after seeding and get 2 286, 5 450, 2 306 and 2 162 kg•hm-2 respectively. N content kept stable in seedling period and decreased sharply after flowing period in all organs except seeds. P content increased slowly in seedling period and decreased quickly after flowing in both stems and leaves and decreased constantly in roots, defoliation and shells. K content in both roots and stems changed significantly in seedling period and decreased after then. K content of green leaves decreased in seedling period and kept steadily during other periods. K content in defoliation changed significantly and irregularly. Both N and K accumulation reached maximum in blooming period and decreased little after then. Accumulation of N and K showed as seedling period＞bud period＞blooming period. P accumulation increased constantly in the whole growth period and showed as pod period＞seedling period＞blooming period. The maximum requirement of N, P and K under high yield cultivation were 217.6, 39.9, and 219.8 kg•hm-2, respectively, and the ratio of 1.0﹕0.18﹕1.01.【Conclusion】Dry matter accumulation and nutrient content and nutrient accumulation showed as a falling after rising in each organs except defoliation and reproductive organ. Accumulation of N, P and K in roots and stems and leaves can be recycled in different degrees. Sufficient fertilizer supply before blooming period in winter oilseed rape is the guarantee of high yield.

Key words: simplifield cultivation, direct seeding, oil-seed rape (Brassica napus L.), nutrients accumulation

LIU Xiao-Wei, LU Jian-Wei, LI Xiao-Kun, BU Rong-Yan, LIU Bo, CI Dan. Dry Matter Accumulation and N, P, K Absorbtion and Utilization in Direct Seeding Winter Oilseed (Brassica napus L.)[J].Scientia Agricultura Sinica, 2011, 44(23): 4823-4832.

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Dry Matter Accumulation and N, P, K Absorbtion and Utilization in Direct Seeding Winter Oilseed (Brassica napus L.)

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