Genomics and Applied Biology 2026, Vol.17, No.1, 51-60 http://bioscipublisher.com/index.php/gab 56 Aphids, beetles, etc. spread faster, so it is necessary to strengthen field inspections and deal with them as early as possible. On the other hand, after dense planting, the stems of the plants become thinner, and they are prone to collapse in the face of wind and rain. At this time, attention should be paid to controlling the amount of nitrogen fertilizer, avoiding excessive growth, and applying soil covering in the middle and later stages to stabilize the plants. In necessary cases, measures to control the plant growth should be taken to reduce losses caused by collapse and pest damage (Figure 3) (Fry et al., 2015; Rens et al., 2021). Figure 3 Asexual life cycle of Phytophthora infestuns on potato tissue (Adopted from Fry et al., 2015) Image caption: A, After moist conditions for several hours (at least 6 to 8 h) at moderate tenperatures (15 to 22°C), the pathogen sporulates from lesions. B, Sporangia are bone on sporangiophores and C, porangia are dehiscent (readily removed from sporangiophores) and are aerially dispersed. D, Sporangia can germinate directly (via a germ tube at warmer temperatures [>18C]) or at lower temperatures (<18C) via zoospores. E, Within 3 to 6 days, young lesions appear on after infection on host tisue (Adopted from Fry et al., 2015) 6 Case Study Based on Field Practice 6.1 Overview and natural conditions of the typical production area test site To test the actual effect of the dense planting yield-increasing measures, the test site was selected in a major potato-producing area of Dingxi, Gansu Province. The altitude here is around 2,000 meters, and rainfall is not abundant, but it mostly occurs during the crop growth period. Combined with sufficient sunlight and a large diurnal temperature difference, it has always been an advantageous condition for the development of potatoes in this area. The soil is loam, with a deep plough layer, and the foundation for tuber growth is good. However, affected by the semi-arid climate, local farmers have long adopted a lower planting density of approximately 2,000 plants per mu to avoid the risk of water shortage. This region has a long history of potato cultivation, with stable average yields per mu, and is an important economic source. Conducting the experiment in this context is more conducive to judging the applicability and yield-increasing potential of the dense planting technology under rain-fed conditions (Zhang et al., 2018; Li et al., 2020).
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