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首页> 外文期刊>Acta Horticulturae >Root pruning effects on seedlings' growth and plant stand establishment rate of watermelon grafted seedlings.
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Root pruning effects on seedlings' growth and plant stand establishment rate of watermelon grafted seedlings.

机译：根系修剪对西瓜嫁接幼苗幼苗生长和植株建立率的影响。

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Two different commercial rootstocks were grafted with each of two commercial watermelon (Citrullus aedulis L.) cultivars. For each combination, splice grafting (SG) and root pruning splice grafting (RPSG) were simultaneously applied. At the end of the nursery period, a sufficient number of 14-day-old seedlings of each grafting combination was transplanted in larger pots filled with vermiculite, divided in three equal groups. In the following 10 days all plants were periodically irrigated with equal amounts of the same nutrient solution, but differing from each other in the quantity of NaCl added to the nutrient solution. On the first and second week after grafting, and 10 days after transplanting, 10 plants of each experimental plot were randomly selected. Root, stem and leaf dry matter was weighted, and leaf area of plants was measured successively for each harvested plant. The relative growth rate (RGR) - and its components, net assimilation rate (NAR) and leaf area ratio (LAR) were computed for each experimental plot. Compared to root pruned splice grafted seedlings, a higher plant dry matter and larger leaf area per plant were recorded for splice grafted seedlings at the end of nursery stage. Despite that, a significantly higher relative growth rate was found for root pruned splice grafted seedlings, mostly due to higher net assimilation rate. Most plant assimilates were allocated to the growth of new root system. The same advantage, in terms of relative growth rate and assimilate allocation, was maintained by RPSG seedlings during the stand establishment period. As a result, a faster establishment rate was assumed. The stand establishment rate of transplanted seedlings was significantly reduced due to the increase of nutrient solution salinity, but again, significantly higher values were recorded in case of root pruned splice grafted seedlings.
机译：将两种不同的商业砧木分别嫁接到两个商业西瓜（Citrullus aedulis L.）品种中。对于每种组合，都同时应用了剪接嫁接（SG）和根修剪剪接嫁接（RPSG）。在育苗期结束时，将每种嫁接组合的足够数量的14天龄幼苗移植到装满ver石的较大花盆中，分成三个相等的组。在接下来的10天中，所有植物都定期用等量的相同营养液灌溉，但添加到营养液中的NaCl量彼此不同。在移植后的第一周和第二周，以及移植后的10天，每个实验区随机选择10株植物。称重根，茎和叶的干物质，并依次测量每种收获植物的植物叶面积。计算每个实验区的相对生长率（RGR）及其成分，净同化率（NAR）和叶面积比（LAR）。与根修剪的嫁接苗相比，苗期末记录的嫁接苗具有更高的植物干物质和更大的叶面积。尽管如此，发现根修剪剪接嫁接苗的相对生长速率明显较高，这主要是由于较高的净同化率。大多数植物同化物被分配用于新根系的生长。在林分建立期间，RPSG幼苗在相对生长率和同化物分配方面保持了相同的优势。结果，假定了更快的建立速率。由于营养液盐分的增加，大大降低了移栽苗的林分建立率，但是再次，在根剪修剪的嫁接苗中记录到的林分定植率明显更高。

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