Distribution of seedlings of daikon (<i>Raphanus sativus</i> L.) seeded with an universal drill and estimation of reasonable seed rates for spaced crops

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  • ドリル条播されたダイコン種子の出芽分布の規則性と適正播種量の算出
  • ドリル ジョウハ サレタ ダイコン シュシ ノ シュツガ ブンプ ノ キソクセイ ト テキセイ ハシュリョウ ノ サンシュツ
  • Distribution of seedlings of daikon (Raphanus sativus L.) seeded with an universal drill and estimation of reasonable seed rates for spaced crops

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Abstract

Distribution of seedlings drilled with a machine with a fluted roll feed mechanism was investigated in view of predicting reasonable seed rates, especially when combined with mechanical thinning operation.<br>1. Distribution of seedlings of daikon (Raphanus sativus L.) in 5, 10 or 20cm sample length of row could be taken as, or approximated to poisson distribution.<br>2. Supposing that seedling distribution is conformed with Poisson′s, estimation is made on a reasonable seed rate.<br>If emergence rate is ρ and length of hills after a mechanical thinning is a, a minimun seed rate for keeping the proportion of hills lacking in seedlings below p is estimated as -l•lnp/a•ρ for a row of length, l.<br>3. Folowing above conditions, number of seeds which will be grown into stands after thinning and singling operations occupies a•ρ/s•p-1/lnp×100% of total number of seeds sawn, where predetermined distance between stands is s.

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