Effects of different seed coating formulations on seed germination and seedling growth of Lespedeza davurica

doi:10.11686/cyxb2020357

Abstract

Abstract:

Based on original research on a seed coating formulation for Lespedeza davurica， in this experiment a fungicide （carbendazim， 50% wettable powder）， water retaining agent （super absorbent polymer， SAP）， filling materials （corn stalk powder） and other coating materials were selected as ingredients for further testing and modification of the recipe. The tests were conducted with L. davurica cv. “Jinnong No.1” and studied the effects of different formulations on seed germination and seedling growth of L. davurica. The results showed that carbendazim to seed ratio 1∶60 effectively solved the problems with seed decay and inactivation during seed germination. SAP at a range of concentrations was used as a water-retaining agent in the coating formulation， and 5% SAP was found to provide optimum efficacy. At this concentration of SAP， water was effectively held， and the seed vigor was the strongest with the highest germination index. In addition， 5% SAP also resulted in a higher emergence rate and seedling growth rates in a greenhouse emergence test， indicating better seedling vigour. Adding corn stalk powder to the coating formulation was also beneficial. A range of powders of different fineness were tested. Among these， fine corn stalk powder （able to pass a 75 μm sieve） resulted in a better germination status then the others tested and enhanced seedling biomass accumulation. The 1000-seed weight of the coated seeds was 2.3 times that of the naked seeds， and the coated seed diameter was close to 2 times that of the naked seeds. The tested seed coating formulation was therefore suitable for industrial production and mechanical seeding.

Key words: L. davurica, seed coating agent, seed germination, emergence

Li-rong TONG, Shun-gang NI, Ya-nan ZHOU, Juan WANG, Fang-shan XIA. Effects of different seed coating formulations on seed germination and seedling growth of Lespedeza davurica[J]. Acta Prataculturae Sinica, 2021, 30(2): 124-134.

Figures/Tables 10

Fig.1 Seed pelletizing coating structure of L. davurica

Fig.2 Effect of different carbendazim to seed ratio on seed germination of L. davurica

Fig.3 Effect of carbendazim of different carbendazim to seed ratio on the number of rot seeds in germination of L. davurica

Fig. 4 Effect of different concentration of water-holding agent in coating formulations on seed germination of L. davurica

Table 1 Effect of different concentration of water-holding agent in coating formulations on the emergence of seedling of L. davurica

处理 Treatment	出苗时间 Emergence time (d)	出苗率 Emergence rate (%)	成苗率 Seedling rate (%)	成苗数/出苗数 Seedling/emergence
CK	2	66.33±0.88d	62.33±0.88d	93.98±0.86b
SAP₀	4	75.33±0.88c	73.67±0.88c	97.85±1.13a
SAP₁	4	85.00±2.03b	83.00±1.20b	97.64±0.70a
SAP₂	4	87.67±0.88a	87.33±0.88a	99.62±0.38a
SAP₃	4	86.33±0.88ab	84.67±0.88ab	98.08±0.76a
SAP₄	4	82.33±0.33b	81.33±0.33b	98.78±0.02a

Fig.5 Effect of silage corn straw powder with different thickness degree in coating formulations on seed germination of L. davurica

Table 2 Effects of silage corn straw powder with different thickness degree in coating formulations on the root length and fresh weight of coating seed of L. davurica

处理 Treatment	根长 Root length (mm)	鲜重 Fresh weight (g·plant^-1)
CK	14.22±0.63a	0.91±0.02b
C₀	15.96±1.06a	1.09±0.03ab
C₁	16.36±0.45a	1.24±0.13a
C₂	16.21±0.50a	1.22±0.11a
C₃	16.10±0.23a	1.18±0.10ab

Fig.6 Effect of different coating treatment on the 1000-kernel weight and coating seed diameter of seed of L. davurica

Fig.7 Factual picture of the comparison of different coating treatments on the seed shape and diameter of L. davurica

Fig.8 Effect of different coating treatment on containing seed rate, single seed rate and qualification rate of L. davurica

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