Effects of Water and Fertilizer Coupling on Growth of Banana and Papaya Seedlings
This experiment analyzed the effects of the coupling of different nitrogen,phosphorus and potassium content ratios and the substrate relative water content on the growth of banana and papaya seedlings,to provide a theoretical basis for the conservation-oriented and precision seedling cultivation.Heeling-in seedlings of'Brazil'banana and'Zihui'papaya were used as experimental materials.Twelve interactive combination treatments(T1-T12)was carried out from four levels of nitrogen,phosphorus and potassium content ratio and three levels of the substrate relative water content by two-factor randomized block design method,and the traditional irrigation and fertilization treatment was used as control(CK).Effects of different treatments on plant height,stem diameter,leaf number,leaf SPAD value,leaf area,shoot dry weight,total root length,root surface area,average root diameter and root tip number were studied,and shoot growth indicators were analyzed by PCA comprehensive evaluation.In the experiment on banana seedlings,T6 treatment had the most obvious effect on plant height,leaf area,shoot dry weight,total root length,root surface area and root average diameter.T1 treatment had the largest stem diameter.The leaf number was the largest in T1,T5 and T6 treatments,which were 7.60 leaves.T5 treatment had the highest leaf SPAD value.T7 treatment had the largest root tip number.The order of PCA comprehensive evaluation scores of shoot growth indicators was T6＞T5＞T1＞T2＞T10＞T3＞T9＞T7＞T11＞T12＞T4＞T8＞CK.In the experiment on papaya seedlings,T10 treatment had the most significant effect on plant height,leaf area,leaf number and shoot dry weight.The leaf number and shoot dry weight in T9 treatment were consistent with T10 treatment,and the total root length,root surface area and root tip number were most significantly increased.The leaf SPAD value and the average root diameter were largest in T11 and T2 treatments,respectively.The order of PCA comprehensive evaluation scores of shoot growth indicators was T10＞T9＞T1＞T1 1＞T6＞T3＞T2＞T5＞T7＞CK＞T12＞T8＞T4.The optimum ratio of nitrogen,phosphorus and potassium content for cultivating seedlings of banana and papaya was 20:10:20,and the optimum substrate relative water content was 80％and 70％,respectively.
bananapapayawater and fertilizer couplinggrowth and developmentnutrition absorption
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