In the game I DM for, one player is playing a ranger. The player asked me if he would be able to cast the *lightning arrow* spell, then use the arrow as ammunition for the *conjure barrage* spell.

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The [*lightning arrow*](https://www.dndbeyond.com/spells/lightning-arrow) spell (PHB, p. 255) has a casting time of 1 bonus action, and a duration of "Concentration, up to 1 minute":

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> The next time you make a ranged weapon attack during the spell’s duration, the weapon’s ammunition, or the weapon itself if it’s a thrown weapon, transforms into a bolt of lightning. Make the attack roll as normal. The target takes 4d8 lightning damage on a hit, or half as much damage on a miss, instead of the weapon’s normal damage.
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> Whether you hit or miss, each creature within 10 feet of the target must make a Dexterity saving throw. Each of these creatures takes 2d8 lightning damage on a failed save, or half as much damage on a successful one.
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The [*conjure barrage*](https://www.dndbeyond.com/spells/conjure-barrage) spell (PHB, p. 225) has a casting time of 1 action and a duration of "Instantaneous":

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> You throw a nonmagical weapon or fire a piece of nonmagical ammunition into the air to create a cone of identical weapons that shoot forward and then disappear. Each creature in a 60-foot cone must succeed on a Dexterity saving throw. A creature takes 3d8 damage on a failed save, or half as much damage on a successful one. The damage type is the same as that of the weapon or ammunition used as a component.
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The rule on [bonus-action spellcasting](https://www.dndbeyond.com/sources/basic-rules/spellcasting#BonusAction) (PHB, p. 202) states:

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> A spell cast with a bonus action is especially swift. You must use a bonus action on your turn to cast the spell, provided that you haven’t already taken a bonus action this turn. You can’t cast another spell during the same turn, except for a cantrip with a casting time of 1 action.
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But then on the next page, it also states in the rules for [concentration](https://www.dndbeyond.com/sources/basic-rules/spellcasting#Concentration) (p. 203; emphasis mine):

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> Normal activity, such as moving and attacking, doesn't interfere with
> concentration. The following factors can break concentration:
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> * Casting another spell that requires concentration. **You lose
> concentration on a spell if you cast another spell that requires
> concentration. You can’t concentrate on two spells at once.**
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Would the ranger be able to cast both spells in the same turn?  

I interpret the last quote as meaning that you can cast 2 spells, if 1 requires concentration and the other does not, unless a spell doesn't count as an attack.

If he can't use them in the same round, could he cast *lightning arrow*, save it until the next round, then use it for *conjure barrage*?