Effects of Maize Straw Cellulose-based Super Absorbent Polymer on Soil Water Retention Capacity and Root Growth of Wheat

doi:10.11924/j.issn.1000-6850.casb2020-0466

Abstract

Abstract:

To study the utilization potentiality of maize straw cellulose-based super absorbent polymer (SAP) in agricultural production, the structures of SAP before and after water absorption were characterized. Meanwhile, the effects of SAP application on soil water retention capacity and root growth of wheat under water stress was studied. The results showed that the swelling of SAP decreased soil bulk density, increased soil maximum water content by 19.1% to 67.6% compared to the treatment without SAP, while decreased the evaporation rate in the first 3 days. Under mild (60%-70% of soil water retention capacity) and moderate (40%-50% of soil water retention capacity) water stress, the root length with 0.4% w/w SAP application increased by 15.9% and 24.7%, while the root activity increased by 29.6% and 43.5%, respectively, compared with those without SAP. However, no significant difference of root activity and root biomass were observed under well-watered condition (75%-90% of soil water retention capacity). In summary, the SAP with excellent water retention capacity is effective in promoting the root growth of wheat, and could relieve the inhibiting effect of water stress on winter wheat root growth.

Key words: super absorbent polymer, water stress, winter wheat, root, amount of dry matter

CLC Number:

Fan Zhen, Ding Xinhui, Zhao Dan, Sun Yu, Qi Hongyu, Jiang Yongfang, Tian Xiaofei. Effects of Maize Straw Cellulose-based Super Absorbent Polymer on Soil Water Retention Capacity and Root Growth of Wheat[J]. Chinese Agricultural Science Bulletin, 2021, 37(17): 51-57.

Figures/Tables 8

References 11

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水分胁迫	SAP用量	株高/cm	地上部干物质量/(g/盆)	根干物质量/(g/盆)	根冠比
W1	SAP0	17.81 d	0.384 f	0.152 f	0.399 a
	SAP1	19.53 c	0.416 ef	0.168 ef	0.402 a
	SAP2	20.80 bc	0.466 de	0.182 de	0.391 a
W2	SAP0	20.35 bc	0.494 cde	0.198 cd	0.403 a
	SAP1	23.99 a	0.558 bc	0.214 bc	0.385 a
	SAP2	24.06 a	0.582 ab	0.226 abc	0.389 a
W3	SAP0	23.11 ab	0.546 bcd	0.212 bc	0.390 a
	SAP1	24.29 a	0.630 a	0.232 ab	0.371 a
	SAP2	24.47 a	0.640 a	0.244 a	0.382 a

水分胁迫	SAP用量	株高/cm	地上部干物质量/(g/盆)	根干物质量/(g/盆)	根冠比
W1	SAP0	17.81 d	0.384 f	0.152 f	0.399 a
	SAP1	19.53 c	0.416 ef	0.168 ef	0.402 a
	SAP2	20.80 bc	0.466 de	0.182 de	0.391 a
W2	SAP0	20.35 bc	0.494 cde	0.198 cd	0.403 a
	SAP1	23.99 a	0.558 bc	0.214 bc	0.385 a
	SAP2	24.06 a	0.582 ab	0.226 abc	0.389 a
W3	SAP0	23.11 ab	0.546 bcd	0.212 bc	0.390 a
	SAP1	24.29 a	0.630 a	0.232 ab	0.371 a
	SAP2	24.47 a	0.640 a	0.244 a	0.382 a

水分胁迫	SAP用量	总长度/(cm/盆)	总体积/(cm³/盆)	总表面积/(cm³/盆)	平均直径/mm	根尖数
W1	SAP0	67.1 d	0.06 c	5.7 c	0.30 a	1059.7 d
	SAP1	72.9 cd	0.08 bc	7.0 abc	0.28 ab	1221.7 cd
	SAP2	89.0 bcd	0.09 abc	7.3 abc	0.23 bc	1669.3 bcd
W2	SAP0	108.3 abc	0.09 abc	8.8 abc	0.27 ab	1675.7 bcd
	SAP1	116.3 ab	0.10 abc	9.0 abc	0.23 bc	2272.7 abc
	SAP2	128.8 a	0.11 ab	9.9 ab	0.23 bc	2710.0 ab
W3	SAP0	124.8 ab	0.10 abc	9.2 ab	0.21 bc	2781.3 ab
	SAP1	142.8 a	0.11 ab	10.5 ab	0.22 bc	2764.0 ab
	SAP2	146.4 a	0.12 a	10.6 a	0.21 bc	3144.0 a

水分胁迫	SAP用量	总长度/(cm/盆)	总体积/(cm³/盆)	总表面积/(cm³/盆)	平均直径/mm	根尖数
W1	SAP0	67.1 d	0.06 c	5.7 c	0.30 a	1059.7 d
	SAP1	72.9 cd	0.08 bc	7.0 abc	0.28 ab	1221.7 cd
	SAP2	89.0 bcd	0.09 abc	7.3 abc	0.23 bc	1669.3 bcd
W2	SAP0	108.3 abc	0.09 abc	8.8 abc	0.27 ab	1675.7 bcd
	SAP1	116.3 ab	0.10 abc	9.0 abc	0.23 bc	2272.7 abc
	SAP2	128.8 a	0.11 ab	9.9 ab	0.23 bc	2710.0 ab
W3	SAP0	124.8 ab	0.10 abc	9.2 ab	0.21 bc	2781.3 ab
	SAP1	142.8 a	0.11 ab	10.5 ab	0.22 bc	2764.0 ab
	SAP2	146.4 a	0.12 a	10.6 a	0.21 bc	3144.0 a