Effects of Different Tillage Methods on Carbon Storage of Soil and Utilization Efficiency of Water and Nitrogen in Wheat

doi:10.7668/hbnxb.2016.04.034

Abstract

Abstract: Based on a long-term field experiment,the effects of different tillage measures on the carbon storage of soil and the utilization efficiency of water and nitrogen in wheat were studied.Four models were designed:deep tillage(T1),deep tillage plus straw returning(T2),shallow tillage(T3),and shallow tillage plus straw returning(T4).The results showed that straw returning had a certain infuenceron soil carbon accumulation.Compared with the organic carbon storage before sowing,it was higher at winter stage in 0-20 cm soil,reached to the highest at jointing stage in 20-40 cm,and also had the maximum value at jointing stage in 40-60 cm except T1 treatment.During the whole growth period,the organic carbon storage was generally higher in straw returning treatment than in no straw returning.T1 treatment increased the soil water content in early growth stage of wheat.The crop water consumption of T2 treatment was 4.2% higher than that of T4 treatment.Straw returning could increase the water use efficiency of wheat.The water use efficiency and irrigation water use efficiency of T2 were 24.9% and 27.6% higher,respectively,than that of T4.Except in flowering stage,the nitrogen content of plant was higher in deep tillage than in shallow tillage.And T2 treatment could significantly improve the nitrogen accumulation of wheat,44% higher than that of no straw returning.Deep tillage increased the nitrogen utilization efficiency by 57.2% compared with the shallow tillage straw returning treatment inhibited the growth of wheat in early growing stage,but promoted the dry matter accumulation in later growing stage.Straw returning could increase the grain number of wheat,so as to raise the grain yield.The grain yield of T2 was 22.1% higher that of T3,and 6.7% higher than that of T1,while it was 14.4% higher in T1 than in T3.The results suggested that straw returning and deep tillage could increase the carbon storage of soil,improve the use efficiency of water and nitrogen,and then increase the grain yield of wheat.

Key words: Deep tillage, Straw returning, Soil carbon storage in wheat field, Water and nitrogen use

CLC Number:

S152.7

LI Chunxi, CHEN Huiting, MA Shouchen, ZHANG Lingling, WANG Jingruo, SHAO Yun. Effects of Different Tillage Methods on Carbon Storage of Soil and Utilization Efficiency of Water and Nitrogen in Wheat[J]. ACTA AGRICULTURAE BOREALI-SINICA, 2016, 31(4): 220-226. doi: 10.7668/hbnxb.2016.04.034.

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