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为了确定除草时间和次数对花生品种艾舒福德(Ashford)果实产量的影响,1964和1965年度在卡萨拉农业研究站进行了试验。自然情况下一年生杂草，主要是野牵牛花（Ipomoea cordofana）及鹿藿草（Rhymchosia memnonia）使花生果实平均减产80%。试验结果表明，花生播种后30天内，至少须除草一次。播后30天和60天两次除草的小区，果实产量由不除草小区的131．5斤/亩，增加到625.3斤/亩。除草三次，即播后15天、30天及45天，比播后30天和60天除草的产量较低，因为除草间隔期太短。播后30天和6 0夭时除草的实效已足够了。单株果数是决定产量的最重要因素。每株15-20个荚果的产量最高，而且这20朵花产生较早的，果实产量较高。杂草使单株分枝数减少，因而减少了每株的果数。千粒重、出仁率和收获指数也受杂草的影响。野牵牛花是最有害的杂草，因为它几乎和花生同时出现，而其种子在整个生长季内不断有发芽的。
In order to determine the effect of the timing and frequency of weeding on the yield of peanut Ashford fruit, trials were conducted at the Kassala Agricultural Research Station in 1964 and 1965. Naturally occurring annual weeds, mainly Ipomoea cordofana and Rhymchosia memnonia, reduce peanut fruit production by 80% on average. The test results showed that the peanut must be weeded at least once within 30 days after sowing. After weeding 30 days and 60 days weeding area twice, the yield of fruit from the non-weeding area 131.5 kg / mu, to 625.3 kg / mu. Weeding three times, 15 days, 30 days and 45 days after sowing, weeding less than 30 and 60 days after sowing, because weeding interval is too short. The effectiveness of weeding on 30 days and 60 days after sowing is sufficient. The number of fruit per plant is the most important factor in determining yield. The yield was 15-20 pods per plant and the 20 flowers produced earlier and the fruit yield was higher. Weeds reduce the number of branches per plant, thus reducing the number of fruit per plant. Thousand grain weight, kernel rate and harvest index are also affected by weeds. Wild morning glory is the weakest weed because it appears almost simultaneously with the peanut, and its seeds continue to germinate throughout the growing season.