Effect of cutting height and nitrogen fertilizer rate on yield and nutritive value of whole-plant mulberry （Morus alba）

doi:10.11686/cyxb2020490

Abstract

Abstract:

In this study， a two-factor randomized block experiment was conducted to determine the yield， botanical characteristics， and nutritive value of a forage mulberry cultivar （Morus alba cv. Chuansisang-1）. Treatments comprised different cutting heights （H₁： 70 cm， H₂： 90 cm， and H₃： 110 cm） and nitrogen fertilization rates （N₁： 138 kg N·ha^-1， N₂： 207 kg N·ha^-1， and N₃： 276 kg N·ha^-1） in Northeast Sichuan， South China. Feeding value of the forage mulberry under the different treatments was evaluated in order to provide data support promotion and utilization of forage mulberry as an animal feed. It was found that herbage yields increased with age under each treatment， and the treatment combination H₂N₃ had the highest herbage yield. Cutting height and nitrogen application rate both had significant effects on the yield， botanical characteristics， and nutritive value of forage mulberry. Cutting height was the main factor affecting the botanical characteristics of forage mulberry， and there were also significant （P<0.05） cutting height×nitrogen fertilization rate interaction effects on herbage yield， single-branch weight， and nutritive value. At the same cutting height， the herbage yield， and neutral detergent fiber of N₃ treatment were the highest， and the crude protein content was higher in N₂ than in N₁ or N₃， and the herbage yield， the number of leaves on main branches and single plant weight were largest under the H₂ treatment. The contents of neutral detergent fiber and acid detergent fiber increased with increase in cutting height. Crude protein and ash contents were highest at H₂， and crude fat content initially increased and then decreased across the three cutting heights. The feeding value of ‘Chuansisang-1’was evaluated using a multivariate subordinate function analysis and the optimal treatment combination was found to be H₂N₃（i.e. a cutting height of 90 cm and nitrogen application rate of 276 kg N·ha^-1）.

Key words: cutting height, nitrogen application rate, whole plant of forage mulberry, yield, nutritional value, multivariate analysis

Hong-lin WANG, Yan-chun ZUO, Xu YAN, Xiao-kang ZHOU, Jing KOU, Xi-zhi YANG, Jun-ying GUO, Jun PU, Hao-ren ZHANG, Zhou-he DU. Effect of cutting height and nitrogen fertilizer rate on yield and nutritive value of whole-plant mulberry （Morus alba）[J]. Acta Prataculturae Sinica, 2021, 30(11): 203-211.

Figures/Tables 6

References 23

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处理 Treatment	鲜草产量Fresh yield		平均值 Average
处理 Treatment	2016	2017	平均值 Average
H₁N₁	32.24±0.96c	48.73±0.89c	40.49±0.93
H₁N₂	35.99±1.37ab	54.57±1.27b	45.28±1.32
H₁N₃	37.66±2.20ab	57.36±1.84b	47.51±2.02
H₂N₁	34.71±0.97ab	55.83±0.73b	45.27±0.85
H₂N₂	36.69±0.95ab	56.86±2.19b	46.78±1.57
H₂N₃	38.91±1.32a	65.56±1.01a	52.24±1.17
H₃N₁	29.60±0.30c	50.98±0.88c	40.29±0.59
H₃N₂	34.91±1.73ab	56.83±1.45b	45.87±1.59
H₃N₃	36.55±1.71ab	57.08±2.41b	46.82±2.06

处理 Treatment	鲜草产量Fresh yield		平均值 Average
处理 Treatment	2016	2017	平均值 Average
H₁N₁	32.24±0.96c	48.73±0.89c	40.49±0.93
H₁N₂	35.99±1.37ab	54.57±1.27b	45.28±1.32
H₁N₃	37.66±2.20ab	57.36±1.84b	47.51±2.02
H₂N₁	34.71±0.97ab	55.83±0.73b	45.27±0.85
H₂N₂	36.69±0.95ab	56.86±2.19b	46.78±1.57
H₂N₃	38.91±1.32a	65.56±1.01a	52.24±1.17
H₃N₁	29.60±0.30c	50.98±0.88c	40.29±0.59
H₃N₂	34.91±1.73ab	56.83±1.45b	45.87±1.59
H₃N₃	36.55±1.71ab	57.08±2.41b	46.82±2.06

处理 Treatment	鲜草产量 Fresh yield	平均值 Mean	干草产量 Hay yield	平均值 Mean
H₁N₁	75.77±0.45cd	78.05±1.41c	15.76±0.27d	15.75±0.28c
H₁N₂	76.87±0.80cd		14.80±0.21e
H₁N₃	81.51±1.71b		16.69±0.41c
H₂N₁	75.09±1.73d	81.86±0.95a	15.51±0.23d	16.75±0.46b
H₂N₂	78.47±1.16bc		15.21±0.39d
H₂N₃	92.03±0.86a		19.52±0.56a
H₃N₁	74.96±0.83d	78.11±1.84b	17.97±0.44b	18.12±0.25a
H₃N₂	78.75±2.63bc		18.00±0.32b
H₃N₃	80.63±1.06b		18.40±0.18b
H	**		**
N	**		**
H×N	**		NS

处理 Treatment	鲜草产量 Fresh yield	平均值 Mean	干草产量 Hay yield	平均值 Mean
H₁N₁	75.77±0.45cd	78.05±1.41c	15.76±0.27d	15.75±0.28c
H₁N₂	76.87±0.80cd		14.80±0.21e
H₁N₃	81.51±1.71b		16.69±0.41c
H₂N₁	75.09±1.73d	81.86±0.95a	15.51±0.23d	16.75±0.46b
H₂N₂	78.47±1.16bc		15.21±0.39d
H₂N₃	92.03±0.86a		19.52±0.56a
H₃N₁	74.96±0.83d	78.11±1.84b	17.97±0.44b	18.12±0.25a
H₃N₂	78.75±2.63bc		18.00±0.32b
H₃N₃	80.63±1.06b		18.40±0.18b
H	**		**
N	**		**
H×N	**		NS

处理 Treatment	总分枝数 Total number of branches	主枝粗 Main branch diameter （cm）	主枝叶片数 Leaf number of main branch	单株重 Weight per plant （g·plant^-1）
H₁N₁	8.57±2.50bc	0.63±0.08e	11.29±1.39c	167.14±44.79d
H₁N₂	9.33±2.56b	0.66±0.07de	12.83±1.34bc	204.83±38.08cd
H₁N₃	9.91±1.63b	0.72±0.09cde	12.45±1.83bc	256.27±67.15bcd
H₂N₁	13.43±2.44a	0.80±0.08abc	14.29±2.37ab	392.29±122.17a
H₂N₂	9.40±2.42b	0.79±0.11abc	13.60±2.84abc	378.20±127.32a
H₂N₃	10.75±2.23b	0.74±0.07abcd	15.42±1.61a	293.83±81.82abc
H₃N₁	7.63±1.93d	0.85±0.13a	13.50±1.50abc	362.50±106.3ab
H₃N₂	8.33±3.71c	0.83±0.08ab	13.56±1.34abc	307.22±85.22abc
H₃N₃	11.56±1.34b	0.76±0.08abcd	12.89±2.73bc	377.78±169.94a
H	NS	*	*	*
N	*	NS	NS	NS
H×N	NS	NS	NS	NS