It is very important to elucidate the nutrient status of wheat canopy to better utilize nitrogen fertilizer and nutrient of wheat straw.Field experiments with five treatments(Basal-topdressing ratios were 1:9,3:7,5:5,7:3 at 255 kg/ha and N0) by using two cultivars(Ningmai 9 & Yumai 34) were conducted in Nanjing during 2010 and 2011.The experiment was sampled at maturity stage.The results showed that grain yield reached the highest at the treatment of N5/5.The dry matter,N,P and K accumulation amount in the straw increased with the increasing of topdressing ratio appropriately.There were significant vertical differences of dry matter,nitrogen,phosphorus and potassium accumulation in the wheat canopy layers.Dry matter mainly accumulated in the middle and upper leaf layer and lower sheath layer,N and P mainly accumulated in the middle and upper leaf and sheath layer,K mainly accumulated in the lower leaf and sheath layer.There were significant linear relationships between dry matter,nitrogen,phosphorus and potassium accumulation and grain yield in different leaf and sheath layers.When the straw stubble(Glume+the leaf and stem-sheath in the fourth layer) was returned to the field only,the proportions of dry matter,N,P and K were 50%,40%,50% and 40% respectively.
SHI Zu-liang
,
WANG Fei
,
GU Ke-jun
,
ZHANG Chuan-hui
,
GU Dong-xiang
,
LI Xiang
,
SUN Ren-hua
,
YANG Si-jun
. Effects of Nitrogen Applications on Vertical Distribution of Dry Matter, Nitrogen,Phosphorus and Potassium of Winter Wheat in Rice-wheat Rotation[J]. Acta Agriculturae Boreali-Sinica, 2014
, 29(4)
: 226
-231
.
DOI: 10.7668/hbnxb.2014.04.039
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