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Figure 1.
Effects of fertilization Poa pratensis L. cv. Qinghai seed Yield. Different lowercase letters represent significant differences at the 0.05 level.
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Figure 2.
Effects of different fertilization treatments on Poa pratensis L. cv. Qinghai seed quality.
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Figure 3.
Effects of different fertilization levels on seed quality of Poa pratensis L. cv. Qinghai.
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Figure 4.
(a) Three-dimensional curved surface diagram of the change in Poa pratensis L. cv. Qinghai seed yield under the interaction of N and P fertilizers. (b) Isogram of Poa pratensis L. cv. Qinghai seed yield under the interaction of N and P fertilizers.
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Figure 5.
Intermonthly changes in (a) temperature, (b) humidity, (c) solar radiation, and (d) precipitation in the Maying area from July 2021 to August 2022.
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Treatment Panicle length /cm Spikelets number Seeds number
/per panicleFloret site utilization Thousand-seed-weight /g Reproductive branch
number per square meterN0P0K0 11.55 ± 0.6abc 16.67 ± 1.76a 91.33 ± 1.33d 0.89 ± 0.03a 0.21 ± 0.01e 2376.73 ± 18.01d N0P2K2 13.64 ± 0.81ab 20.67 ± 2.19a 106.67 ± 0.33c 0.78 ± 0.03c 0.29 ± 0.01abc 2794.13 ± 57.27c N1P2K2 12.27 ± 0.13abc 16.00 ± 0.58a 121.33 ± 6.84b 0.85 ± 0.11b 0.23 ± 0.01de 3189.67 ± 122.00b N2P0K2 11.58 ± 1.58abc 17.67 ± 1.20a 128.00 ± 1.53ab 0.91 ± 0.01a 0.28 ± 0.01bc 3353.89 ± 35.22ab N2P1K2 11.78 ± 0.26abc 20.67 ± 4.81a 131.33 ± 5.04ab 0.90 ± 0.03a 0.26 ± 0.02cd 3444.86 ± 198.35ab N2P2K2 13.29 ± 0.61ab 18.67 ± 0.88a 134.00 ± 4.73a 0.90 ± 0.05a 0.23 ± 0.01e 3528.68 ± 125.73a N2P3K2 11.05 ± 1.17abc 18.67 ± 2.40a 127.33 ± 1.86ab 0.85 ± 0.03b 0.31 ± 0.01ab 3327.71 ± 34.95ab N2P2K0 11.2 ± 0.97abc 19.67 ± 3.71a 123.00 ± 2.52ab 0.91 ± 0.03a 0.22 ± 0.02e 3201.11 ± 53.94b N2P2K1 11.58 ± 0.16abc 18.67 ± 2.19a 124.33 ± 3.38ab 0.86 ± 0.09ab 0.27 ± 0.01cd 3249.9 ± 25.04b N2P2K3 13.01 ± 1.12ab 18.00 ± 1.15a 127.67 ± 3.18ab 0.88 ± 0.03ab 0.23 ± 0.02de 3345.80 ± 28.44ab N3P2K2 12.73 ± 1.24abc 18.00 ± 2.08a 125.33 ± 0.88ab 0.87 ± 0.03ab 0.31 ± 0.01ab 3271.64 ± 57.50ab N1P1K2 13.83 ± 0.74a 18.33 ± 2.40a 121.67 ± 3.28b 0.78 ± 0.03c 0.26 ± 0.01cd 3181.97 ± 24.36b N1P2K1 10.82 ± 0.36bc 15.33 ± 1.76a 127.00 ± 2.08ab 0.80 ± 0.09bc 0.21 ± 0.01e 3339.12 ± 33.80ab N2P1K1 9.95 ± 0.92c 16.00 ± 1.00a 125.00 ± 2.89ab 0.88 ± 0.03ab 0.32 ± 0.01a 3278.06 ± 36.58ab Table 1.
Effects of fertilization on seed yield components of Poa pratensis L. cv. Qinghai.
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KMO test and Bartlett test KMO value 0.746 Bartlett sphericity test Approximate χ2 82.566 df 6 P 0.000*** Table 2.
Factor analysis test of seed quality.
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Numbering Treatment N/kg·hm−2 P2O5/kg·hm−2 K2O/kg·hm−2 1 N0P0K0 0 0 0 2 N0P2K2 0 100 60 3 N1P2K2 65 100 60 4 N2P0K2 130 0 60 5 N2P1K2 130 50 60 6 N2P2K2 130 100 60 7 N2P3K2 130 150 60 8 N2P2K0 130 100 0 9 N2P2K1 130 100 30 10 N2P2K3 130 100 90 11 N3P2K2 195 100 60 12 N1P1K2 65 50 60 13 N1P2K1 65 100 30 14 N2P1K1 130 50 30 Note: The number of subscripts in the second column is the code of each factor. Table 3.
N, P, K ratio treatment and fertilizer application amount.
Figures
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Tables
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