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Studying the effect of different concentrations of exogenous plant growth regulators on the growth and nutritional components of paper mulberry is of great significance for high-yield cultivation and popularization of paper mulberry. Hybrid paper mulberry seedlings were used as test materials, and three concentrations (150, 250, 350 mg/L) of plant growth regulators (GA3, DA-6, PP333 and 6-BA) were used to spray the whole plant, and then the growth indexes and nutrients were measured. The results showed that DA-6 and PP333 could promote the growth of paper mulberry and the accumulation of DM with a plant height of 73.13 cm, a stem diameter of 13.48 mm, the number of main stem nodes and branches were 32.00 and 11.67, and the DM was 97.69 g. GA3 significantly increased the plant height and average internode length of paper mulberry seedlings (P<0.05), and decreased stem diameter. 6-BA showed a slight inhibition on the growth of paper mulberry and the accumulation of DM. From the perspective of the effect on quality, the proportion of CP whole plant of paper mulberry treated with GA3 showed different degrees of increase, and this promoting effect decreased with the increase of application concentration. DA-6 and PP333 increased the proportion of NDF, ADF, ADL in the whole plant and TP of paper mulberry in different degrees. Among them, the paper mulberry treated with 250 mg/L PP333 had the highest TP, which was 16.27 g. All nutrients of paper mulberry treated with 6-BA were less than CK. The experiment indicates that the four plant growth regulators in the study had the following order: PP333 >DA-6 >GA3 > 6-BA. it is considered that spraying PP333 at 250 mg/L after 20 d of planting paper mulberry is conducive to cultivating strong paper mulberry and promoting the accumulation of DM and TP. [ABSTRACT FROM AUTHOR]

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[Objective] The present paper aimed to explore the effects of soil conditioners containing calcium, magnesium and phosphorus on acidification reduction and crop growth in protected red soil through field experiments. [Method] Using Italian lettuce as material, field plot experiment was carried out on protected red soil, and 5 treatments were set up: Control (local conventional fertilization), treatment T1 (local conventional fertilization + calcium, magnesium and phosphorus soil conditioner 1500 kg/hm²), treatment T2 (local conventional fertilization + calcium, magnesium and phosphorus soil conditioner 3000 kg/hm²), treatment T3 (local conventional fertilization + calcium, magnesium and phosphorus soil conditioner 6000 kg/hm²), treatment MT3 (local conventional fertilization + calcium, magnesium and phosphorus soil conditioner 6000 kg/hm² + biological bacteria agent). Each treatment was repeated 3 times. The agronomic traits and quality indexes of lettuce, soil pH, soil organic matter and soil bacterial community diversity were determined. [Result] T3 treatment significantly increased the contents of soil organic matter, total phosphorus, available phosphorus and exchangeable calcium, especially total phosphorus (22.56%). Compared with CK, the pH, base saturation and Ve content of lettuce in T3 significantly increased by 0.7 units, 257.14% and 14.40%, respectively, while the contents of exchangeable acid, exchangeable aluminum and available manganese significantly decreased by 600.00% 75.00% and 37.27%, respectively. Compared with the treatment of MT3, the hydrolytic nitrogen content, cation exchange capacity and lettuce plant height significantly increased by 44. 56%,4.01% and 11.29%, respectively. The key environmental factors affecting the main bacterial communities (phylum level) of the protected lettuce field were organic matter (29.8%), pH (24.9%) and available potassium (16.3%). [Conclusion] Applying 6000 kg/hm² calcium-magnesium-phosphorus soil conditioner can increase the pH of protected red soil, reduce the exchangeable acid, exchangeable aluminum content, and soil acidification, improve soil fertility and bacterial community structure, moreover, its combined application with microbial bacterial agent can increase lettuce plant height and Ve content. [ABSTRACT FROM AUTHOR]

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