| Studies on absorption and use of N, P and K by spring maize under super-yield cultivation |
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| DOI：10.7606/j.issn.1000-7601.2011.02.03 |
| Key Words: maize super yield nutrient absorption apparent balance |
| Author Name | Affiliation | | YANG Hengshan | College of Agronomy, Inner Mongolia University for Nationalities，Tongliao, Inner Mongolia 028042, China | | GAO Julin | College of Agronomy, Inner Mongolia Agriculural University, Huhhot, Inner Mongolia 010019，China | | ZHANG Yuqin | College of Agronomy, Inner Mongolia University for Nationalities，Tongliao, Inner Mongolia 028042, China | | BI Wenbo | College of Agronomy, Inner Mongolia University for Nationalities，Tongliao, Inner Mongolia 028042, China | | ZHANG Ruifu | College of Agronomy, Inner Mongolia University for Nationalities，Tongliao, Inner Mongolia 028042, China | | FAN Xiuyan | College of Agronomy, Inner Mongolia University for Nationalities，Tongliao, Inner Mongolia 028042, China | | GAO Qiang | College of Resources and Environmental Sciences, Jilin Agricultural University, Changchun, Jilin 130118, China |
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| Abstract: |
| Using Jinshan 27 as tested material and ordinary-high-yield cultivation (the yield was 14.647 t/hm2) as CK to study the N, P and K’ absorption, accumulation, distribution and use of spring maize under super-yield cutivation(the yield was 16.861 t/hm2). The result showed that N, P and K absorption amount and rate under super-yield cultiva-tion were higher than those of CK at all growing stages, the absorption ratio and total absorption of N, P and K under su-per-yield cultivation was higher than those of CK after silking stage. The difference of N, P and K accumulation under super-yield cultivation and CK didn't reach significant level before silking stage, and this difference became larger after silking stage. The difference of N accumulation became highly significant at full mature stage between thie two kinds of
cultivation, and the difference of P, K accumulation also reached sigmificant level. N distribution ratio in grain under su-per-yield cultivation was markedly higher than that of CK, and N distribution ratio in stem was lower than that of CK;
and P distribution ratio in leaf and root were markedly lower than that of CK; the ratio of K distribution in root was signif-
icantly less than that of CK. The harvest index of N, P and K under Buper-yield cultivation was higher than that of CK, and N use efficiency of grain was nearly the 8ame as CK, and P use efficiency of grain was lower than that of CK, and K
use efficiency of grain was more than that of CK. N and P amount needed per unit grain were basically the same as CK,
and the amount of K needed was less than that of CK. N was apparently deficient, and P and K were apparently surplus under super-yield cultivation. |
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