Effects Of Nitrogen Nutrition On Quality Of Wheat/Maize Intercropping And Monocropping

This study compared the effect of nitrogen nutrition on quality of wheat/maize intercropping with that of sole wheat and sole maize. The results obtained were as follows:1. There were significant quality advantages of intercropped wheat compared with sole wheat. Under the same nitrogen application condition, protein content, sedimentation value, dry gluten and wet gluten of intercropped wheat were increased by 14.78%, 11.01%, 3.42% and 4.45% respectively, compared with sole wheat. Moreover, the protein content, sedimentation value, dry gluten and wet gluten in the border rows of intercropped wheat were higher by 20%, 6%, 23% and 11% respectively than those of inner rows.2. The effects of nitrogen application on protein content, sedimentation value, dry gluten and wet gluten of both intercropped wheat and sole wheat were evident according to statistic analysis.3. There were significant quality disadvantages of intercropped maize compared with the sole. Under the same nitrogen application condition, the contents of protein, oil and one hundred kernel weight of intercropped maize were decreased by 15.3%, 14.9% and 40.6%, compared with sole maize. The effects of nitrogen application on the contents of protein, oil and one hundred kernel weight of maize were evident according to statistic analysis.4. The effect of different nitrogen application proportion ofmaize on quality property of intercropped wheat wasn't evident . With the same amount of nitrogen application, deferring top-dressing time improved the quality of wheat and maize.5. Grain yield and quality of both intercropped and sole wheat, maize were improved while the amount of Nitrogen application increased from 0 to 300kg/hm2. The regression analysis showed that the quality property of both intercropped and sole wheat, maize were weakly correlated to their grain yield respectively. Under the condition of this experiment, the amount of 300kg/hm2 nitrogen application could improved quality and yield simultaneously.6. With the same nitrogen application, chlorophyll content of intercropped wheat was higher than that of sole, while chlorophyll content of intercropped maize was lower than that of sole maize. Chlorophyll content of intercropped and sole wheat at middle grain filling stage was separately positively correlated to protein content, sedimentation value (r=0.960*, 0.948*, 0.968*, 0.957*, respectively). Moreover, the chlorophyll contents of intercropped maize and sole maize at middle grain filling stage were separately positively correlated to protein content(r=0.861* , 0.870*, respectively).7. Under the same nitrogen application condition, both nitrogen assimilation pre-anthesis and total nitrogen assimilation of intercropped wheat were higher than those of sole wheat, while nitrogen assimilation after-anthesis of intercropped wheat was lower than that of the sole. Total nitrogen assimilation of both sole wheat and the intercropped were positively correlated to protein content, sedimentation value respectively (r=0.936* , 0.987* , 0.955* , 0.998*).