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箭杆杨主要分布在我国黄河中、上游地区,生长迅速,材质较好,因此栽培较为广泛。特别由于箭杆杨树冠窄小,是营造农田防护林和实现农田林网化的优良树种。为了培育优质高产的箭杆杨苗木,满足绿化的要求,1964年我们从施肥措施入手,探讨箭杆杨苗木对主要矿质元素的需要,比较氮、磷、钾三要素对箭杆杨苗木生长和干物质积累的影响,以寻求合理施肥的依据。一、试验材料和方法本试验主要采用盆栽,辅以田间栽培。1.盆栽试验采用土培法。设置 N、P、K、N+P、P+K、M+P、N+P+K (等七个处理和一个对照,重复10次。试验所用肥料为 NH_4NO_3、Ca(H_2PO_4)、KCl 三种。每公斤土按有效成份0.3克计。试验盆为直径26.5厘米、高27.5厘米的双层白瓷盆。每盆装土18公斤,最大灌
Arrow Yang mainly in the Yellow River in China, the upper reaches of the rapid growth, better material, so cultivation is more extensive. In particular, due to narrow shaft crown poplar is to create farmland shelterbelts and the realization of farmland network of fine tree species. In order to cultivate high quality and high yield of arrow seedling seedlings to meet the requirements of greening, we started from fertilization measures in 1964 to discuss the need of seedlings of arrowhead poplar to the main mineral elements. Comparing the three elements of nitrogen, phosphorus and potassium on the growth and Dry matter accumulation in order to seek a reasonable basis for fertilization. First, the test materials and methods This experiment mainly used potted plants, supplemented by field cultivation. 1. Pot experiment using soil culture method. The treatments of N, P, K, N + P, P + K, M + P and N + P + K were repeated 10 times with one control. The fertilizers tested were NH_4NO_3, Ca (H_2PO_4) Species per kg of soil according to the active ingredient 0.3 grams meter test basin diameter of 26.5 cm, 27.5 cm high double white porcelain pots each pot of 18 kg of soil, the largest irrigation