Effects of different soil conditioner dosages on soil improvement and pyrethrum cultivation in heavy metal contaminated farmland

doi:10.16178/j.issn.0528-9017.20240848

Abstract

Abstract:

To investigate the effects of different soil conditioner dosages on the remediation of heavy metal-contaminated farmland and its impact on pyrethrum cultivation，this experiment adopted a single-factor randomized block design. Treatments included applying 0，50，100，150，and 200 kg of soil conditioner per 667 m²（corresponding to CK，T1，T2，T3，and T4 treatments，respectively）. The results showed that compared with CK，T3 and T4 treatments significantly（p<0.05）reduced soil bulk density，total cadmium content，and available cadmium content，with the T4 treatment showing the best performance，achieving values of 1.19 g·cm^-3，1.52 mg·kg^-1，and 0.62 mg·kg^-1，respectively. Soil pH value was significantly increased in the T2，T3，and T4 treatments，with the T4 treatment again being the most effective，reaching a pH value of 6.28. In terms of pyrethrum cultivation，compared with CK，the T2，T3，and T4 treatments significantly shortened the growth period of pyrethrum，with the T4 treatment performing the best. The plant height and stem diameter in the T4 treatment increased significantly，reaching 91.67 cm and 7.03 mm，respectively. The dry flower yield and output value of pyrethrum were significantly higher in the T2，T3，and T4 treatments，with the T4 treatment achieving the highest values of 184.06 kg and 11 043.38 yuan per 667 m²，respectively. Although soil conditioner did not significantly alter the pyrethrin content，it increased the pyrethrum yield in T2，T3，and T4 treatments，resulting in a significant increase in total pyrethrin yield. In conclusion，applying 200 kg of soil conditioner per 667 m² in heavy metal^-contaminated farmland is beneficial for soil improvement and pyrethrum cultivation.

Key words: soil conditioner, contaminated farmland, soil improvement, pyrethrum, cadmium, available cadmium

CLC Number:

S156

JIANG Xianmei, MA Kun, HU Yuming, TU Chunbao, LI Jinhui, WU Choufei, WANG Zhe. Effects of different soil conditioner dosages on soil improvement and pyrethrum cultivation in heavy metal contaminated farmland[J]. Journal of Zhejiang Agricultural Sciences, 2026, 67(2): 504-509.

Figures/Tables 8

Fig. 1 Soil bulk density under different soil conditioner dosages

Fig. 2 Total cadmium content in soil under different soil conditioner dosages

Fig. 3 Available cadmium content in soil under different soil conditioner dosages

Fig. 4 soil pH value under different soil conditioner dosages

Table 1 Effect of different soil conditioner dosages on the growth period of pyrethrum

处理	封行期	现蕾期	抽薹期	初花期	盛花期
CK	177±2 a	178±2 a	186±2 a	242±2 a	264±0.47 a
T1	168±2 b	171±1 b	179±1 ab	238±4 ab	258±0.82 a
T2	159±5 c	168±2 c	171±2 b	230±1 b	251±1.70 b
T3	149±2 d	149±2 d	152±1 c	227±2 b	246±0.94 bc
T4	141±3 e	143±1 d	145±2 c	224±3 b	242±2.05 c

Fig. 5 Plant height and stem diameter of pyrethrum under different soil conditioner dosages

Table 2 Dried flower weight，yield，and output value of pyrethrum under different soil conditioner dosages

处理	百朵干花重/g	每667 m²干花产量/kg	每667 m²干花产值/元
CK	16.31±0.42 c	102.24±1.94 c	6 134.64±116.14 c
T1	16.92±0.09 bc	117.15±7.89 c	7 029.00±473.24 c
T2	17.23±0.19 b	142.81±7.65 b	8 568.40±458.80 b
T3	17.55±0.09 ab	167.59±8.03 a	10 055.40±481.92 a
T4	18.26±0.33 a	184.06±5.08 a	11 043.38±304.95 a

Fig. 6 Content and yield of pyrethrin in pyrethrum under different soil conditioner dosages

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