|Table of Contents|

Effects of Nitrogen Application Rate on the Nitrogen Absorption of Watermelon in Gravel-mulched Field

《北方园艺》[ISSN:1001-0009/CN:23-1247/S]

Issue:
2020年12
Page:
39-46
Research Field:
Publishing date:

Info

Title:
Effects of Nitrogen Application Rate on the Nitrogen Absorption of Watermelon in Gravel-mulched Field
Author(s):
ZHANG Jiaqun1; WANG Xina2; HU Meijuan3
(1.Agricultural Service Center of Chengguan Town，Pingluo County，Pingluo，Ningxia 753400；2.College of Agriculture，Ningxia University，Yinchuan，Ningxia 750021；3.Agricultural Service Center of Taole Town，Pingluo County，Pingluo，Ningxia 753400)
Keywords:
nitrogen application rate; nitrogen absorption of plant; SPAD value
PACS:
-
DOI:
10.11937/bfyy.20194163
Abstract:
In order to explore optimum application of nitrogen fertilizer for watermelon in gravel-mulched field，the effects of nitrogen application rate on plant nitrogen absorption was studied.Five nitrogen levels were set in the experiment，0，45，90，135，180 kg?hm-2.The nitrogen content of each organ，SPAD of different parts of the leaves，yield were measured.The results showed that nitrogen application of plants at 45-135 kg?hm-2 increased with nitrogen application increasing.The nitrogen accumulation of 45-180 kg?hm-2 of stems and leaves were higher than those of no nitrogen application in expanding.When nitrogen application was 45-135 kg ? hm-2 during the sitting stage，the accumulation of stem nitrogen increased with increasing nitrogen application.The SPAD of the top leaf was the highest when the nitrogen application rate was 90-135 kg?hm-2，and the SPAD of the middle leaf was the highest when the nitrogen level was 45-135 kg?hm-2.The base leaf SPAD was the highest when the nitrogen application rate was 135-180 kg?hm-2.The R2 between the N rates and the top leaf SPAD was 0.972 in the early stage of the expanding，and the R2 between the N rates and the SPAD of the middle leaf were 0.960，0.959 in the stretching and the late stage of the expanding.The R2 between the N rates and the SPAD of the base leaf were 0.988 in the stretching stage.The R2 between the N content of the top leaves and the SPAD were 0.911，0.947，0.844，0.968 in stretching stage，fruiting stage，middle expanding stage and matury.The R2 between the N content of the middle leaves and the SPAD were 0.934，0.955，0.988，0.946，0.878 in stretching stage，fruiting stage，and expanding stage.The R2 between the N content of the basal leaves and the SPAD were 0.875，0.835，0.872 in stretching stage，fruiting stage，and the early stage of the expanding.The R2 between yield and the top leaves SPAD were 0.881，0.944，0.835，0.975，0.897 in the stretching stage，fruiting stage，and expanding stage.The R2 between yield and the SPAD of the middle leaves were 0.961，0.959，0.869，0.997 in the fruiting stage，middle stage and late stage of the expanding，and matury.The R2 between yield and the SPAD of the basal leaf were 0.834，0.983，0.987，0.948 in the stretching stage，fruiting stage,and early stage and late stage of the expanding.Nitrogen application could increase the nitrogen accumulation of the plant and SPAD，and the nitrogen application rate，the N content of leaf and yield had the best correlation with the SPAD of the middle leaf.

References:

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Last Update: 2020-08-25