马尾松人工中龄林针叶营养成分研究

通过４月份９年生马尾松林采自不同部位、不同林木等级、不同针龄的针叶，对针叶的Ｎ、Ｐ、Ｋ、Ｃａ、Ｍｇ五大营养元素进行分析，结果表明：马尾松１年生针叶的五大营养元素含量排序为Ｎ＞Ｃａ＞Ｋ＞Ｍｇ＞Ｐ，而两年生，半年生针叶的排序则为Ｎ＞Ｋ＞Ｃａ＞Ｍｇ＞Ｐ；马尾松优势木树冠上、中、下部１年生针叶各元素含量差异不明显；优势木、平均木、被压木上部１年生针叶营养元素之间也几乎无差异；针龄的不同，营养特点不同，各元素之间有极显著差异；马尾松两年生针叶Ｃａ具有一定的移动性。该文同时又探讨了对每个元素进行诊断时的采集部位，Ｎ、Ｃａ采集半年生针叶，Ｐ、Ｍｇ采两年生叶，Ｋ采１年生叶，以优势木最好。

三倍体、四倍体桑品种与制种成绩的关系

不同桑品种的桑叶营养成分有一定差异,对原蚕的饲养成绩和制种成绩也有不同影响.原蚕苏5、苏6在5龄饷食起分别用四倍体、三倍体和二倍体(湖桑32号)桑品种饲育,调查全茧量、茧层量和死笼率,以及造卵数、产卵数、不良卵率等蚕种生产成绩,其结果用多元方差进行分析,结果如下,

Planting Performance of Pennisetum purpureum Schumab cv.Purple in the Southern Region of China

[Objective] The present experiment was conducted to investigate the yield,adaptability and quality characteristics of Pennisetum purpureum Schumach cv. Purple to provide reference for the certification and development of new varieties.[Method] With P. purpureum Schumab cv. Purple as experimental material, the variety comparison tests were conducted in Nanning, Lingyun, and Tiandeng in Guangxi from 2007 to 2009, and variety regional trials were conducted in Danzhou of Hainan, Fuzhou of Fujian and Zhanjiang of Guangdong from 2011 to 2013. Its comprehensive characters of plant height, hay yield, stem-leaf ratio and nutritional components were determined, and were compared with those of P. purpureum × P.americanum cv. Reyan No.4 and P. purpureum Schum cv. Guiminyin. [Result] The average height of P. purpureum Schumach cv. Purple was 706.54 cm, which was5.92% and 8.44% lower than that of P. purpureum × P. americanum cv. Reyan No.4 and P. purpureum Schum cv. Guiminyin, respectively. The average hay yield of P. purpureum Schumach cv. Purple was 32.74 t/ha in Nanning, Lingyun, and Tiandeng of Guangxi from 2007 to 2009, and 22.41 t/ha in Danzhou of Hainan, Fuzhou of Fujian and Zhanjiang of Guangdong from 2011 to 2013. Although its hay yield was lower than two control varieties, the difference was not significant（P 0.05）.The stem-leaf ratio of P. purpureum Schumach cv. Purple was 0.98：1. Moreover,the analysis on the nutritional components of dry matter showed that compared with P. purpureum × P. americanum cv. Reyan No.4 and P. purpureum Schum cv.Guiminvin, the crude fiber of P. purpureum Schumab cv. Purple was decreased by4.76% and 2.78%, respectively; the neutral detergent fiber decreased by 5.07% and2.22%, respectively; the acid detergent fiber was decreased by 2.54% and 1.99%,respectively; the crude fat was increased by 64.29% and 43.75%, respectively; the calcium content was increased by 28.00% and 33.33%, respectively; the phosphorus content was increased by 9.68% and 22.73%, respectively; the total content of amino acid was increased by 43.23% and 68.41%, respectively; the anthocyanin content of leaf was increased by 400.00% and 216.90%, respectively（P 0.05）.[Conclusion] P. purpureum Schumach cv. Purple is a new high-quality forage variety with wide adaptability, high yield, rich nutrient and good palatability, which is appropriate for comprehensive exploitation and application in the southern region of China.

Tea-Grown Soils and Tea Quality in Sichuan and Chongqing, China

Made teas and typical tea-grown soils in Sichuan and Chongqing were collected to investigate soil nutrients, related soil properties and tea quality. The tea-grown soils in Sichuan and Chongqing are distributed mainly in mountainous areas. The high annual precipitation (over 1100 mm), precipitous soil slopes, low cohesion among soil particles and high soil porosity suggested that intensive erosion and leaching might occur in these soils. Moreover, they were very acidic and poor in mineral nutrients such as N, P, K, Ca and Mg except S. The average content of total S was 20.40 g kg-1, much higher than that of organic matter in these soils, revealing that S in the tea-grown soils existed mainly in inorganic forms and very little in organic forms. Water-extractable S accounted for only a small amount of total S, which showed that most parts of sulfur in these soils were insoluble in W8ter. K and S varied greatly in made teas. The concentrations of N and P, however, varied little in these teas even though they differentiated significantly in the tea-grown soils. The high concentration of nitrogen in made teas could result in the high free amino acids and low polyphenol of teas. Significantly positive correlation was established between potassium and polyphenol in made teas. Teas with high ratio of phenol to free amino acids were usually good in taste and appearance.

Planting Performance of Several Elephant Grass Species in Northern Guangxi Zhuang Autonomous Region

This study aimed to screen suitable species of Pennisetum purpureum for planting in northern Guangxi Zhuang Autonomous Region. During 2012-2014, a comparative field trial was carried out in Lingyun County of Baise City in northern Guangxi to compare plant height, yield, stem-leaf ratio and nutrient composition am-ong Pennisetum purpureum Schumab cv. Purple, P. purpureum Schum cv. Guimin and P. purpureum Rich ＆#215; P. americana King grass cv. Reyan No.4. The results in-dicated that average annual fresh yield of P. purpureum Schumab cv. Purple reached 141.4 t/hm2, which was 2.3 t/hm^2 higher than that of P. purpureum_Rich×P. americana_King grass cv. Reyan No.4; both average annual fresh yield of these two species was lower than that of P. purpureum Schum cv. Guimin. Stem-leaf ratio of P. purpureum Schumab cv. Purple was the lowest （1.17）, which was 17.8% lower compared with P. purpureum Schum cv. Guimin, with significant differences （P〈0.05）, indicating that P. purpureum Schumab cv. Purple had more leaves. Crude protein content of P. purpureum_Schumab cv. Purple was slightly lower than that of P. purpureum Rich×P. americana_King grass cv. Reyan No.4, while P. purpureum Schumab cv. Purple was superior to P. purpureum Schum cv. Guimin and P. pur-pureum Rich ×P. americana_King grass cv. Reyan No.4 in other indicators. Specifi-cal y, P. purpureum Schumab cv. Purple contained 26.6% of dry matter, 39.1% of nitrogen-free extract and 2.9% of crude fat.

黄豆叶是畜禽的好饲料

黄豆及其加工副产品豆饼在畜禽养殖中已被广泛用作蛋白质补充饲料。但黄豆叶却至今未被充分利用。其实,黄豆叶也是猪、牛、羊、兔、禽的好饲料。1.黄豆叶营养价值据测定,黄豆叶营养成分丰富,含粗蛋白质6.1%,粗脂肪1.8%,粗纤维4.0%,在每1千克黄豆叶中,还含有钙9.3克、磷0.7克。3千克的干黄豆叶。