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从一九七五年开始,我们在本省各地进行了8个杨树新品种的区域试验。良种配良法,品种的优良性状才能充分地表现出来。在试验过程中,我们提倡“三大一深”的栽培技术措施。“三大一深”即大苗、大穴、大株行距和深栽。大苗规格:苗龄二年生或二年生根一年生干的截干苗,高度4—5米,根径4—5厘米,大穴标准。结合全面整地,栽植穴为一立方米;大株行距为4×6米,4×8米,8×8米;深栽要求一般为80厘米。 本文报导了杨树新品种深栽后对根系发育和分布的影响,为制定杨树速生丰产的技术措施提供依据。
Since 1975, we have conducted eight regional trials of new poplar varieties across the province. Good varieties with good law, good varieties of characters can be fully demonstrated. During the experiment, we advocate “three major and one deep” cultivation techniques and measures. “Three major and one deep” that big seedlings, big hole, big line spacing and deep planting. Miao specifications: Miao-year biennial or biennial root truncus, the height of 4-5 meters, 4-5 cm in diameter, large hole standards. With a comprehensive land preparation, planting hole is one cubic meter; large line spacing of 4 × 6 meters, 4 × 8 meters, 8 × 8 meters; deep planting requirements are generally 80 cm. This paper reports the effect of deep planting new varieties on the development and distribution of root system and provides the basis for the technical measures of poplar fast growing and high yield.