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Effects of Boron Application on the Forage Traits in the Pure and Mixed Cultures of Orchardgrass and White Clover. III. Changes in the contents and yields of N-compounds(crude/pure protein and soluble N-compounds) in forages

Orchardgrass 및 White Clover의 단파 및 혼파재배에서 붕소의 시용이 목초의 여러 특성에 미치는 영향. III. 목초 중 질소화합물(조/순단백질 및 수용성 질소화합물)의 함량 및 수량 변화

  • 정연규 (순천대학교 농업생명과학대학)
  • 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 third part was concerned with the changes in the contents and yields of nitrogen compounds(crude/pure protein and soluble N-compound) in forages. The results obtained are summarized as follows: 1. With no additional fertilization, especially nitrogen, in a pure culture, the $B_{0}$ and $B_4$ treatments on white clover decreased the amount of crude/pure protein, and showed nitrogen deficiency symptoms. However, the optimum boron application($B_2$) positively resulted in the increase of crude and pure protein, especially pure protein, and the content ratio of pure protein/soluble N-compounds. With additional fertilization, especially nitrogen, differences were not found among the boron treatments($B_{0}$, $B_2$, and $B_4$). 2. Owing to the decline of white clover as affected by the additional fertilization, especially nitrogen, in the grass-clover mixed cultures, the effects of B-application on these contents of white clover were different and relatively low, compared with the pure cultures. But the positive effect of $B_2$ treatment tended to be similar to the pure cultures. Also, it was recognized that the $B_2$ treatment resulted in the increase of their contents in orchardgrass, however, the effect was relatively minor compared with that of white clover. 3. The optimum B application(B$_2$) on white clover influenced relatively better on the yields of crude and pure protein than on the dry matter yields, especially with no additional fertilization. The effects of boron application on the contents and yields of crude and pure protein were different according to the forage species, whether it was a pure or mixed culture, and additional fertilization.

Orchardgrass 및 white clover의 단파 및 혼파재배에서 미량요소 붕소(B)의 시비수준별 목초의 생육상, 뿌리/근류 형성, 수량성, 영양성분/무기양분의 함량 및 초종간 경합지수 등에 미치는 영향을 구명하였다. 처리내용은 다양 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 시험으로 수행하였다. 본 III보에서는 목초 중 질소화합물(조/순단백질 및 수용성 N-화합물)의 함량 및 이들의 수량성 등에 미치는 영향을 검토하였다. 1. 단파재배에서 white clover는 무추비시 $B_{0}$$B_4$ 처리구는 함량 감소와 N-결핍증상을 보였다. 이에 비해서 $B_2$ 처리구는 이들의 함량이 양호하였으며 추비(특히 N)시보다 순단백질 함량이 더 높았고 이에 따라서 순단백질/수용성 질소화합물의 함량비도 높았다. 추비(특히 N)시에는 B-처리별 조/순단백질의 함량차이가 상대적으로 경미하였다. 2. 혼파재배에서는 추비(특히 N)로 인한 white clover 생육의 열세로 단파재배의 경우와는 다소 다른 B 시비효과를 보였으며, 조/순단백질 함량이 단파보다는 낮았다. 그러나 적합한 B 시비($B_2$)의 시비효과는 단파재배시와 같이 양호하였다. orchardgrass에 대한 붕소의 시용효과는 단파 및 혼파재배 공히 $B_2$, 처리구가 순단백질의 함량 제고에 다소 긍정적 효과를 보였으나 white clover보다 상대적으로 경미하였다. 3. 적합한 B 시비($B_2$)는 white clover의 건물 수량에 미치는 효과보다 조/순단백질의 수량에 미치는 효과가 상대적으로 더 높았다. N-화합물의 함량과 이들의 수량에 미치는 붕소의 시비효과는 초종, 단파와 혼파재배, 그러고 추비의 시비조건에 따라서 차이가 있었다

Keywords

References

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