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The efficiency of a durum wheat-winter pea intercrop to improve yield and wheat grain protein concentration depends on N availability during early growth

机译：硬质小麦-豌豆间作提高产量和小麦籽粒蛋白质浓度的效率取决于早期生长期间的氮素有效性

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摘要

Grain protein concentration of durum wheat is often too low, particularly in low-N-input systems. The aim of our study was to test whether a durum wheat - winter pea intercrop can improve relative yield and durum wheat grain protein concentration in low-N-input systems. A 2-year field experiment was carried out in SW France with different fertilizer-N levels to compare wheat (Triticum turgidum L., cv. Nefer) and pea (winter pea, Pisum sativum L., cv. Lucy) grown as sole crops or intercrops in a row-substitutive design. Without N fertilization or when N was applied late (N available until pea flowering less than about 120 kg N ha-1), intercrops were up to 19% more efficient than sole crops for yield and up to 32% for accumulated N, but were less efficient with large fertilizer N applications. Wheat grain protein concentration was significantly higher in intercrops than in sole crops (14% on average) because more N was remobilized into wheat grain due to: i) fewer ears per square metre in intercrops and ii) a similar amount of available soil N as in sole crops due to the high pea N2 fixation rate in intercrops (88% compared to 58% in sole crops).
机译：硬质小麦的籽粒蛋白质浓度通常过低，特别是在低氮输入系统中。我们的研究目的是测试低氮输入系统中硬质小麦-冬豌豆间作能否提高相对产量和硬质小麦籽粒蛋白质浓度。在法国西南部进行了为期2年的田间试验，使用了不同的氮肥水平，比较了作为唯一农作物的小麦（豌豆，冬小麦，Pisum sativum L.，露西）的小麦（Triticum turgidum L.，Nev。或行替换设计中的间作。如果不施氮，或者晚施氮（直到豌豆开花的氮少于120 kg N ha-1时才可施氮），农作物间作的效率比单季作物高19％，累积氮的效率高达32％，但是大量施用氮肥效率较低。间作中的小麦籽粒蛋白质浓度显着高于单季作物（平均14％），因为更多的N被转移到小麦籽粒中，这是由于：i）间作中每平方米的耳朵更少，以及ii）可用土壤氮的数量与间作中豌豆N2的固定率高（88％，而单作作物则为58％）。

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    Bedoussac Laurent; Justes Eric;

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  • 年度 2010
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