The present study was conducted to analyze cotton cultivar and location differences in motes, and to determine the relationships among these and ginning outturn. Therefore, the seed cotton of five promising hybrids na...The present study was conducted to analyze cotton cultivar and location differences in motes, and to determine the relationships among these and ginning outturn. Therefore, the seed cotton of five promising hybrids namely;G.77 × Pima S6 and G.84 × (G.74 × G.68) growing in [Kafr El-Sheikh - Kafr El-Dawar - Etay El-Barood - Damietta], G.89 × Pima S6 growing in [El-Sharkia - El-Gharbiya - El-Dakahliya - El-Monofiya], G.83 × (G.75 × 5844) × G.80 and G.90 × Australian growing in [Sohag - El-Minia - Beni-Sueif - El-Faium] were used in this study. The results obtained indicate that the varieties exhibited different behavior responses to environmental conditions. On the whole, environmental factors associated with differences in place of growth, appeared to have much more influence on the number of motes than did varietal factors. Most of the locks for the promising hybrids at the different locations tend to cluster around the mean of 6 or 7 seeds per lock. There is a fairly marked tendency for the lock index, lint weight and lint percentage to decrease as the motes percentage increase. On the other hand, most of the promising hybrids under study tend to increase in the seed index as the motes percentage increase. However, the increasing in seed index as a result of the increasing in motes percentage for some cotton cultivars growing at different environments could be explain the difference in behavior for these cotton cultivars in lint percentage.展开更多
通过对雪峰山区35年生杉木无性系测定林调查分析,得知各无性系之间胸径、树高、单株材积及大径材的株比例、出材量、出材率均存在极显著差异,为优良无性系选择提供了科学依据。各重复(不同立地条件)之间以上指标同样存在极显著差异,说...通过对雪峰山区35年生杉木无性系测定林调查分析,得知各无性系之间胸径、树高、单株材积及大径材的株比例、出材量、出材率均存在极显著差异,为优良无性系选择提供了科学依据。各重复(不同立地条件)之间以上指标同样存在极显著差异,说明立地条件对杉木无性系的生长也极其重要。本试验选择出9个高产大径材优良无性系,胸径达27.8 cm以上、树高达21.3 m以上、单株材积达0.6467 m 3以上、大径材的株比例达70.0%、出材量达487.1 m 3·hm-2、出材率达71.1%以上,分别大于对照13.0%、6.0%、32.9%、40.0%、76.8%、41.1%以上。展开更多
为探究不同配方施肥对杉木人工林大径材生长的影响,筛选杉木大径材培育的最佳施肥配方与施肥量,以24年生杉木人工林为研究对象,选用“3414”不完全处理(钾固定)、测土配方、测树配方以及微量元素平衡配方在内的12种施肥处理,分析比较不...为探究不同配方施肥对杉木人工林大径材生长的影响,筛选杉木大径材培育的最佳施肥配方与施肥量,以24年生杉木人工林为研究对象,选用“3414”不完全处理(钾固定)、测土配方、测树配方以及微量元素平衡配方在内的12种施肥处理,分析比较不同施肥处理下杉木人工林的径阶结构、大径材出材量和出材率。结果表明:施肥4 a后,测土配方(处理10)处理下,杉木人工林大径材株数占比最高,达总株数的53.33%;处理10的大径材出材量的增长量也最高,达199.64 m 3·hm-2,比对照(处理1)高63.77%;处理10和处理8的大径材出材率及其增长量均高于其他处理,处理10的出材率最高(70.65%),处理8的出材率增长量最高(17.28%)。处理10即氮、磷、钾肥的施用量分别为140、500和60 g·株-1时,对试验区的杉木近熟林大径材培育效果最佳;林地施肥后,肥效发挥需要一定时间,因此,短期内各处理间的大径材出材量和出材率均无显著差异;从大径材定向培育效果来看,处理8是仅次于处理10的较优施肥方案,表明浓度较高的氮肥和浓度适中的磷肥配合施用是促进杉木近熟林大径材培育的有效手段。展开更多
文摘The present study was conducted to analyze cotton cultivar and location differences in motes, and to determine the relationships among these and ginning outturn. Therefore, the seed cotton of five promising hybrids namely;G.77 × Pima S6 and G.84 × (G.74 × G.68) growing in [Kafr El-Sheikh - Kafr El-Dawar - Etay El-Barood - Damietta], G.89 × Pima S6 growing in [El-Sharkia - El-Gharbiya - El-Dakahliya - El-Monofiya], G.83 × (G.75 × 5844) × G.80 and G.90 × Australian growing in [Sohag - El-Minia - Beni-Sueif - El-Faium] were used in this study. The results obtained indicate that the varieties exhibited different behavior responses to environmental conditions. On the whole, environmental factors associated with differences in place of growth, appeared to have much more influence on the number of motes than did varietal factors. Most of the locks for the promising hybrids at the different locations tend to cluster around the mean of 6 or 7 seeds per lock. There is a fairly marked tendency for the lock index, lint weight and lint percentage to decrease as the motes percentage increase. On the other hand, most of the promising hybrids under study tend to increase in the seed index as the motes percentage increase. However, the increasing in seed index as a result of the increasing in motes percentage for some cotton cultivars growing at different environments could be explain the difference in behavior for these cotton cultivars in lint percentage.
文摘通过对雪峰山区35年生杉木无性系测定林调查分析,得知各无性系之间胸径、树高、单株材积及大径材的株比例、出材量、出材率均存在极显著差异,为优良无性系选择提供了科学依据。各重复(不同立地条件)之间以上指标同样存在极显著差异,说明立地条件对杉木无性系的生长也极其重要。本试验选择出9个高产大径材优良无性系,胸径达27.8 cm以上、树高达21.3 m以上、单株材积达0.6467 m 3以上、大径材的株比例达70.0%、出材量达487.1 m 3·hm-2、出材率达71.1%以上,分别大于对照13.0%、6.0%、32.9%、40.0%、76.8%、41.1%以上。
文摘为探究不同配方施肥对杉木人工林大径材生长的影响,筛选杉木大径材培育的最佳施肥配方与施肥量,以24年生杉木人工林为研究对象,选用“3414”不完全处理(钾固定)、测土配方、测树配方以及微量元素平衡配方在内的12种施肥处理,分析比较不同施肥处理下杉木人工林的径阶结构、大径材出材量和出材率。结果表明:施肥4 a后,测土配方(处理10)处理下,杉木人工林大径材株数占比最高,达总株数的53.33%;处理10的大径材出材量的增长量也最高,达199.64 m 3·hm-2,比对照(处理1)高63.77%;处理10和处理8的大径材出材率及其增长量均高于其他处理,处理10的出材率最高(70.65%),处理8的出材率增长量最高(17.28%)。处理10即氮、磷、钾肥的施用量分别为140、500和60 g·株-1时,对试验区的杉木近熟林大径材培育效果最佳;林地施肥后,肥效发挥需要一定时间,因此,短期内各处理间的大径材出材量和出材率均无显著差异;从大径材定向培育效果来看,处理8是仅次于处理10的较优施肥方案,表明浓度较高的氮肥和浓度适中的磷肥配合施用是促进杉木近熟林大径材培育的有效手段。
