Crops ›› 2021, Vol. 37 ›› Issue (4): 184-190.doi: 10.16035/j.issn.1001-7283.2021.04.028

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Effects of Different Intercropping Modes of Green Manure Replacing Chemical Fertilizer on Cassava (Manihot esculenta Crantz) Traits and Yield

Tang Hongqin(), Li Zhongyi, Dong Wenbin, Wei Caihui, He Tieguang(), Meng Yancheng, Tang Hailing, Mo Yongcheng   

  1. Institute of Agricultural Resource and Environment, Guangxi Academy of Agricultural Sciences, Nanning 530007, Guangxi, China
  • Received:2021-01-25 Revised:2021-06-03 Online:2021-08-15 Published:2021-08-13
  • Contact: He Tieguang E-mail:tanghq@gxaas.net;tghe118@163.com

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Abstract:

This study aimed to explore the effects of green manure instead of chemical fertilizer on the growth and yield of cassava and to solve the key technical problems such as synergism between continuous cropping cassava soil fertility improvement and related technologies. Field experiments with eight trial treatments were conducted from 2019 to 2020 with the cassava variety "South America No.1" as the test material and investigated the parameters including stem diameter, SPAD, root diameter, root length, stem fresh weight per plant, root fresh weight, plant height, single leaf weight, root number per plant, and plot yield of cassava. The results showed that the cassava yield was the highest under treatment 5 (cassava straw returning+12.5% chemical fertilizer reduction+12.5% nutrient elements equivalent to black bean green manure returned to the field), and the best fitting equation was obtained. In a word, green manure straw returning and intercropping improved soil fertility on the whole and affected the final yield of cassava by significantly affecting root diameter, single leaf weight, and root number per plant.

Key words: Cassava, Green manure, Intercropping, Correlation, Principal component analysis

Table 1

Fertilization level of each treatment kg/hm2"

处理
Treatment		 秸秆
Straw		 总施肥量Total fertilizer rate 施肥种类及用量Type and dosage of fertilizer
N P2O5 K2O 复合肥（15-15-15）
Compound fertilizer (15-15-15)		 尿素
Urea		 氯化钾
Potassium chloride
1 (CK) 不还田 195.00 90.00 195.00 600.00 228.26 169.35
2 还田 195.00 90.00 195.00 600.00 228.26 169.35
3 还田 170.63 78.75 170.63 525.00 199.73 148.19
4 还田 146.25 67.50 146.25 450.00 171.20 127.02
5 还田 170.63 78.75 170.63 525.00 199.73 148.19
6 还田 146.25 67.50 146.25 450.00 171.20 127.02
7 还田 170.63 78.75 170.63 525.00 199.73 148.19
8 还田 146.25 67.50 146.25 450.00 171.20 127.02

Fig.1

The field planting patterns"

Table 2

Cassava yield of plot in 2019 and 2020"

年份
Year		 平均值
Mean (kg)		 平均值标准误差Standard error
of mean		 中位数
Median
(kg)		 众数
Mode
(kg)		 标准差
Standard
deviation		 方差
Variance		 最小值
Minimum
(kg)		 最大值
Maximum
(kg)		 小区总产量
Total yield
of plots (kg)
2019 179.16 5.47 174.70 167.60 26.800 718.24 136.45 232.70 4300
2020 186.10 4.60 187.62 136.16 22.543 508.20 136.16 214.20 4466

Table 3

Multiple comparison of cassava yield among different treatments"

处理
Treatment		 处理Treatment
1 2 3 4 5 6 7
2 -3.365
3 13.840** 17.205**
4 28.285** 31.650** 14.445**
5 -4.745* -1.380 -18.585** -33.030**
6 19.885** 23.250** 6.045** -8.400** 24.630**
7 37.870** 41.235** 24.030** 9.585** 42.615** 17.985**
8 62.365** 65.730** 48.525** 34.080** 67.110** 42.480** 24.495**

Fig.2

The yield distribution of each treatment"

Table 4

Correlation between treatments and agronomic traits of cassava"

项目
Item		 SPAD 块根直径
Root diameter		 茎径
Stem diameter		 块根长
Root
length		 单株茎秆鲜重
Stem fresh weight per plant		 单株块根鲜重
Root fresh
weight per plant		 株高
Plant height		 单片叶重
Single leaf weight		 单株块根数
Number of root tubers per plant
相关性Correlation 0.014 0.304* 0.085 0.168 0.122 0.161 0.030 0.463** 0.791**
显著性（双尾）
Significance (double tail)		 0.912 0.015 0.505 0.184 0.337 0.205 0.814 0.000 0.000

Table 5

Correlation analysis of cassava agronomic traits"

性状
Trait		 SPAD 块根直径
Root
diameter		 茎径
Stem diameter		 块根长
Root
length		 单株茎秆鲜重
Stem fresh
weight per plant		 单株块根鲜重
Root fresh
weight per plant		 株高
Plant height		 单片叶重
Single leaf weight		 单株块根数
Number of root tubers per plant
块根直径
Root diameter		 -0.395**
茎径Stem diameter -0.315* 0.887**
块根长Root length -0.612** 0.871** 0.885**
单株茎秆鲜重
Stem fresh weight
per plant		 -0.593** 0.903** 0.920** 0.965**
单株块根鲜重
Root fresh weight
per plant		 -0.592** 0.910** 0.909** 0.967** 0.980**
株高Plant height -0.262* 0.834** 0.905** 0.825** 0.858** 0.851**
单片叶重
Single leaf weight		 -0.317* 0.882** 0.800** 0.830** 0.824** 0.822** 0.704**
单株块根数
Number of root
tubers per plant		 0.078 0.339* 0.132 0.191 0.157 0.181 0.004 0.543**
小区产量
Yield per plot		 0.121 0.378* 0.165 0.184 0.157 0.192 0.055 0.565** 0.910**

Table 6

Explanation of total variance of cassava agronomic traits"

成分
Component		 初始特征值Initial Eigenvalue 提取载荷平方和Extract the payload of the quadratic sum
总计
Aggregate		 方差百分比
Percentage of variance (%)		 累积
Accumulate (%)		 总计
Aggregate		 方差百分比
Percentage of variance (%)		 累积
Accumulate (%)
1 6.552 72.797 72.797 6.552 72.797 72.797
2 1.255 13.949 86.746 1.255 13.949 86.746
3 0.831 9.233 95.980
4 0.102 1.137 97.116
5 0.098 1.092 98.209
6 0.081 0.905 99.114
7 0.037 0.411 99.525
8 0.026 0.291 99.816
9 0.017 0.184 100.000

Table 7

Principal component coefficient matrix of cassava agronomic traits"

农艺性状
Agronomic trait		 成分Component
F1 F2
茎径Stem diameter 0.937 -0.024
SPAD -0.526 0.487
块根直径Root diameter 0.949 0.143
块根长Root length 0.970 -0.097
单株茎秆鲜重Stem fresh weight per plant 0.983 -0.118
单株块根鲜重Root fresh weight per plant 0.982 -0.099
株高Plant height 0.879 -0.122
单片叶重Single leaf weight 0.888 0.372
单株块根数Number of root tubers per plant 0.253 0.900
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