| Effects of intercropping and phosphorus application on biomass, nitrogen and phosphorus absorption of two forage species |
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| DOI：10.7606/j.issn.1000-7601.2019.05.12 |
| Key Words: S. guianensis H. contortus intercropping P application biomass nitrogen and phosphorus absorption |
| Author Name | Affiliation | | ZHANG De | Institute of Tropical Eco-agricultural Sciences, Yunnan Academy of Agriculture Sciences, Yuanmou, Yunnan 651399, China； Yuanmou Dry-Hot Valley Botanical Garden, Yuanmou, Yunnan 651399, China | | LONG Hui-ying | Institute of Tropical Eco-agricultural Sciences, Yunnan Academy of Agriculture Sciences, Yuanmou, Yunnan 651399, China； Yuanmou Dry-Hot Valley Botanical Garden, Yuanmou, Yunnan 651399, China | | ZENG Li-ping | College of science, Honghe University，Mengzi, Yunnan 661199，China | | LIU Yi-xiang | College of Plant Protection, Yunnan Agricultural University, Kunming, Yunnan 65020124, China |
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| Abstract: |
| In order to understand the effect of phosphorus (P) application on grass biomass and nutrient absorption in the intercropping system of S. guianensis and H. contortus, two factors randomized block field experiments were designed with two planting patterns (intercropping and monoculture) and two P levels (P0 and P75, in which P0 indicated no P). The results showed that in the intercropping system, P application increased the biomass by 30.10% over the control and N uptake by 21.51% of H. contortus, but reduced biomass by 5.53%, N by 3.73%, and P by 3.18% of S. guianensis. In 2015, above-ground biomass of H. contortus in the intercropping system under P75 level was significantly higher by 31.00% than that of monoculture (P<0.05). Compared with the crops without P application, the above-ground biomass of S. guianensis and H. contortus in the intercropping system was increased by 41.31% and 52.68%, respectively, with P application. Under the two P levels (P＞0.05), there were no significant differences in land equivalent ratio (LER), intercropping system productivity (SP) and interspecific competitiveness. However, S. guianensis was the weaker competition in the intercropping system with H. contortus. Under P0 and P75 levels, N and P uptake of S. guianensis in the intercropping system were lower than in monoculture system by 67.74% (P0) and 67.19% (P75), respectively (P<0.05). With the same situation, N uptake of H. contortus in the intercropping system was higher than monoculture system by 5.79% (P0) and 44.28% (P75), respectively, and P uptake was higher by 13.80% (P0) and 6.61% (P75). |
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