黒ボク心土を用いた異なる施肥リンレベル下でのダイズの生育と根粒活性に及ぼすVA菌根菌接種の影響

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The responses of soybean (cv. T202) to Vesicular-Arbuscular Mycorrhizal Fungus (VAMF ; Glomus elunicatum) under 3 different phosphorus application levels (P_1, 100 mg P ; P_5, 500 mg P ; P_<30>, 3000 mg P/2×10^<-4> a pot, 2.3 kg air dry Soil) in an Andosoil (Bray II-P < 0.1 μg g^<-1>ds. ) weere examined in regards to growth, VAM formation, acetylene reduction activity (ARA), N accumulation and P absorption at the growth stages of initial flowering, milk-ripening and maturing. Positive effects of VAMF infection on growth, P and N accumulation, and ARA were obtained, especially in the earlier growth stage, corresponding to the level of VAMF infection rates and infected root lengths which were higher in lower P applications (P_1, & P_5). In the initial flowering stage, significant stimulations of ARA and P accumulation in nodules were observed due to VAMF infection at lower P application levels (P_1, P_5), resulting in earlier N accumulation in pod-grain at the milk-ripening stage, however, accompanying steep decreases in ARA and nodule P concentrations at this stage as compared to non-VAMF treatment. Even under the 50% cut-off of light by shading from just before milk-ripening to the maturing stage, positive effects of VAMF on growth and N and P accumulations were found. Under the high-P application level (P_<30>), VAMF infection affected soybean growth negatively in the milk-ripening stage, whereas in the final maturing stage, it brought about stimulative effects on drymatter production and N and P accumulations in pod-grain through maintaining ARA activity, maybe due to unknown factors except the improvement of P nutrition.
1998-02-05

黒ボク心土を用いた異なる施肥リンレベル下でのダイズの生育と根粒活性に及ぼすVA菌根菌接種の影響

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