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Effects of Boron Application on the Forage Traits in the Pure and Mixed Cultures of Orchardgrass and White Clover - IV. Changes in the contents of micronutrients(Fe, Mn, Zn, Cu, and B) in forages -

Orchardgrass 및 White Clover의 단파 및 혼파재배에서 붕소의 시용이 목초의 여러 특성에 미치는 영향 - IV. 목초 중 미량요소(Fe, Mn, Cu, Zn과 B)의 함량 변화 -

  • Published : 2003.09.01

Abstract

This pot experiment was conducted to find out the effects of boron application( $B_{0}$ ) ; control, B$_1$; 0.2, $B_2$; 2.0, $B_3$; 6.0, $B_4$; 15.0 boron me/pot) on the forage performance of pure and mixed cultures of orchardgrass and white clover. The fourth part was concerned with the changes in the contents of B, Fe, Mn, Cu, and Zn in forages. The results obtained are summarized as follows: 1. The boron(B) contents of both forages and their differences among the B treatments generally decreased according to the cutting order. The B contents of white clover were somewhat lower in the $B_{0}$ than in the $B_2$. However, the differences in the yields between $B_{0}$ and $B_2$ were relatively great. It was probably caused by the latent B-deficiency in the $B_{0}$. Compared with white clover, the B contents of orchardgrass had relatively great differences between the $B_{0}$ and B$_2$, but both yields tended to be similar. 2. The contents of Fe, Mn, Cu, and Zn in both forages were generally different according to the forage species, whether it was a pure or mixed cultures, and additional fertilization. The effects of B application on their contents were different according to the micronutrients and above factors. 3. The Fe contents of white clover were lower in the $B_{0}$ and $B_4$ than in the$ B_2$. It tended to be related to the weak growth of roots and low yields in the $B_{0}$ and $B_2$. However, there were not consistent in the changes of contents of Mn, Cu, and Zn by the rates of B application. 4. The effects of B application on the total ion concentrations of Fe, Mn, Cu, and Zn were not consistent in both forages. However, the concentrations were generally affected by the changes in the contents of Mn and Zn. The concentrations of white clover were higher in a pure than in mixed culture.

orchardgrass 및 white clover의 단파 및 혼파재배에서 미량요소 붕소(B)의 시비수준별 목초의 생육상, 뿌리/근류 형성, 수량성, 양분의 함량 및 초종간 경합지수 등에 미치는 영향 등을 구명하였다. 처리내용은 다량 및 미량요소 시비를 동일하게 한 조건에서 5 수준의 붕소 처리: 1) $B_{0}$ ; 0.0, 2) $B_1$; 0.2, 3) $B_2$; 2.0. 4) $B_3$; 6.0, 5) $B_4$; 15.0me B/pot로 glasshouse에서 pot시험으로 수행하였다. I보(생육상), II보(수량성), III보(조단백질)에 이어서 본 IV보에서는 목초 중미량요소(Fe, Mn, Cu, Zn 및 B)의 함량 및 이들의 충 농도에 미치는 영향을 검토하였다. 1. 예취가 진행되어 감에 따라서 두 목초 중 B-함량이 공히 낮아졌고, B 시비수준간 차이도 줄어들었다. white clover에서 B-함량이 B$_{0}$ 처리구는 B$_2$ 처리구 보다 약간 낮았지만 수량성은 큰 차이를 보였고, 이는 $B_{0}$ 처리구의 잠복성 붕소결핍에 기인한 것으로 보였다. 이에 비해서 orchardgrass는 상대적으로 더 큰 차이와 예취 후반기에 크게 낮아졌지만 수량차이는 미약하였다. 2. 일반적으로 목초 중 Fe, Mn, Cu 및 Zn의 함량은 우선 초종, 단파/혼파재배 및 다양요소추비의 시비 여부에 따라서 차이를 보였으며, B 시비수준별 이들의 함량 변화는 미량요소의 종류와 상기 조건에 따라서 차이를 보였다. 3. white clover 중 Fe-함량은 적정 B 처리구 ($B_2$)에 비해서 $B_{0}$$B_4$처리구에서는 낮았다. 이는 $B_{0}$$B_4$ 처리구에서 뿌리발육의 저해/수량감소 특성과 연관된 것으로 보였다. 그러나 orchardgrass는 일관성을 보이지 안 했다. 두 목초 중 Mn, Cu 및 Zn의 함량에 미치는 붕소시비의 영향은 일관성을 보이지 안 했다. 4. 붕소 시용수준이 미량요소 양이온 총 농도((Fe+Mn+Cu+Zn)에 미치는 효과는 미약하였다. 일반적으로 충 농도의 변화는 Mn과 Zn의 함량에 밀접한 영향을 받았고, 반면에 Fe과 Cu의 함량은 경미한 영향을 보였다. white clover 중총 농도는 혼파보다 단파재배에서 더 높았다.

Keywords

References

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